Perhaps the oldest, most pernicious form of human bias is that of men toward women. It often started at the moment of birth. In ancient Athens, at a public ceremony called the amphidromia, fathers would inspect a newborn and decide whether it would be part of the family, or be cast away. One often socially acceptable reason for abandoning the baby: It was a girl. Female infanticide has been distressingly common in many societies — and its practice is not just ancient history. In 1990, the Nobel Prize-winning economist Amartya Sen looked at birth ratios in Asia, North Africa, and China and calculated that more than 100 million women were essentially “missing” — meaning that, based on the normal ratio of boys to girls at birth and the longevity of both genders, there was a huge missing number of girls who should have been born, but weren’t. Sen’s estimate came before the truly widespread adoption of ultrasound tests that could determine the sex of a fetus in utero — which actually made the problem worse, leading to a wave of sex-selective abortions. These were especially common in countries like India and China; the latter’s one-child policy and old biases made families desperate for their one child to be a boy. The Economist has estimated that since 1980 alone, there have been approximately 50 million fewer girls born worldwide than would naturally be expected, which almost certainly means that roughly that nearly all of those girls were aborted for no other reason than their sex. The preference for boys was a bias that killed in mass numbers.But in one of the most important social shifts of our time, that bias is changing. In a great cover story earlier this month, The Economist reported that the number of annual excess male births has fallen from a peak of 1.7 million in 2000 to around 200,000, which puts it back within the biologically standard birth ratio of 105 boys for every 100 girls. Countries that once had highly skewed sex ratios — like South Korea, which saw almost 116 boys born for every 100 girls in 1990 — now have normal or near-normal ratios. Altogether, The Economist estimated that the decline in sex preference at birth in the past 25 years has saved the equivalent of 7 million girls. That’s comparable to the number of lives saved by anti-smoking efforts in the US. So how, exactly, have we overcome a prejudice that seemed so embedded in human society?Success in school and the workplaceFor one, we have relaxed discrimination against girls and women in other ways — in school and in the workplace. With fewer limits, girls are outperforming boys in the classroom. In the most recent international PISA tests, considered the gold standard for evaluating student performance around the world, 15-year-old girls beat their male counterparts in reading in 79 out of 81 participating countries or economies, while the historic male advantage in math scores has fallen to single digits. Girls are also dominating in higher education, with 113 female students at that level for every 100 male students. While women continue to earn less than men, the gender pay gap has been shrinking, and in a number of urban areas in the US, young women have actually been outearning young men. Government policies have helped accelerate that shift, in part because they have come to recognize the serious social problems that eventually result from decades of anti-girl discrimination. In countries like South Korea and China, which have long had some of the most skewed gender ratios at birth, governments have cracked down on technologies that enable sex-selective abortion. In India, where female infanticide and neglect have been particularly horrific, slogans like “Save the Daughter, Educate the Daughter” have helped change opinions. A changing preferenceThe shift is being seen not just in birth sex ratios, but in opinion polls — and in the actions of would-be parents.Between 1983 and 2003, The Economist reported, the proportion of South Korean women who said it was “necessary” to have a son fell from 48 percent to 6 percent, while nearly half of women now say they want daughters. In Japan, the shift has gone even further — as far back as 2002, 75 percent of couples who wanted only one child said they hoped for a daughter.In the US, which allows sex selection for couples doing in-vitro fertilization, there is growing evidence that would-be parents prefer girls, as do potential adoptive parents. While in the past, parents who had a girl first were more likely to keep trying to have children in an effort to have a boy, the opposite is now true — couples who have a girl first are less likely to keep trying. A more equal futureThere’s still more progress to be made. In northwest of India, for instance, birth ratios that overly skew toward boys are still the norm. In regions of sub-Saharan Africa, birth sex ratios may be relatively normal, but post-birth discrimination in the form of poorer nutrition and worse medical care still lingers. And course, women around the world are still subject to unacceptable levels of violence and discrimination from men.And some of the reasons for this shift may not be as high-minded as we’d like to think. Boys around the world are struggling in the modern era. They increasingly underperform in education, are more likely to be involved in violent crime, and in general, are failing to launch into adulthood. In the US, 20 percent of American men between 25 and 34 still live with their parents, compared to 15 percent of similarly aged women. It also seems to be the case that at least some of the increasing preference for girls is rooted in sexist stereotypes. Parents around the world may now prefer girls partly because they see them as more likely to take care of them in their old age — meaning a different kind of bias against women, that they are more natural caretakers, may be paradoxically driving the decline in prejudice against girls at birth.But make no mistake — the decline of boy preference is a clear mark of social progress, one measured in millions of girls’ lives saved. And maybe one Father’s Day, not too long from now, we’ll reach the point where daughters and sons are simply children: equally loved and equally welcomed.A version of this story originally appeared in the Good News newsletter. Sign up here!See More:

In 2024, Egypt completed its 1,155km stretch of the Cairo–Cape Town Highway, a 10,228km‑long road connecting 10 African countries – Egypt, Sudan, South Sudan, Ethiopia, Kenya, Tanzania, Zambia, Zimbabwe, Botswana and South Africa.   The imaginary of ‘Cape to Cairo’ is not new. In 1874, editor of the Daily Telegraph Edwin Arnold proposed a plan to connect the African continent by rail, a project that came to be known as the Cape to Cairo Railway project. Cecil Rhodes expressed his support for the project, seeing it as a means to connect the various ‘possessions’ of the British Empire across Africa, facilitating the movement of troops and natural resources. This railway project was never completed, and in 1970 was overlaid by a very different attempt at connecting the Cape to Cairo, as part of the Trans‑African Highway network. This 56,683km‑long system of highways – some dating from the colonial era, some built as part of the 1970s project, and some only recently built – aimed to create lines of connection across the African continent, from north to south as well as east to west.  Here, postcolonial state power invested in ‘moving the continent’s people and economies from past to future’, as architectural historians Kenny Cupers and Prita Meier write in their 2020 essay ‘Infrastructure between Statehood and Selfhood: The Trans‑African Highway’. The highways were to be built with the support of Kenya’s president Jomo Kenyatta, Ghana’s president Kwame Nkrumah and Ghana’s director of social welfare Robert Gardiner, as well as the United Nations Economic Commission for Africa (UNECA). This project was part of a particular historical moment during which anticolonial ideas animated most of the African continent; alongside trade, this iteration of Cape to Cairo centred social and cultural connection between African peoples. But though largely socialist in ambition, the project nevertheless engaged modernist developmentalist logics that cemented capitalism.  Lead image: Over a century in the making, the final stretches of the Cairo–Cape Town Highway are being finished. Egypt completed the section within its borders last year and a section over the dry Merille River in Kenya was constructed in 2019. Credit: Allan Muturi / SOPA / ZUMA / Alamy. Above: The route from Cairo to Cape Town, outlined in red, belongs to the Trans‑African Highway network, which comprises nine routes, here in black The project failed to fully materialise at the time, but efforts to complete the Trans‑African Highway network have been revived in the last 20 years; large parts are now complete though some links remain unbuilt and many roads are unpaved or hazardous. The most recent attempts to realise this project coincide with a new continental free trade agreement, the agreement on African Continental Free Trade Area (AfCFTA), established in 2019, to increase trade within the continent. The contemporary manifestation of the Cairo–Cape Town Highway – also known as Trans‑African Highway (TAH) 4 – is marked by deepening neoliberal politics. Represented as an opportunity to boost trade and exports, connecting Egypt to African markets that the Egyptian government view as ‘untapped’, the project invokes notions of trade steeped in extraction, reflecting the neoliberal logic underpinning contemporary Egyptian governance; today, the country’s political project, led by Abdel Fattah El Sisi, is oriented towards Egyptian dominance and extraction in relation to the rest of the continent.  Through an allusion to markets ripe for extraction, this language brings to the fore historical forms of domination that have shaped the connections between Egypt and the rest of the continent; previous iterations of connection across the continent often reproduced forms of domination stretching from the north of the African continent to the south, including the Trans‑Saharan slave trade routes across Africa that ended in various North African and Middle Eastern territories. These networks, beginning in the 8th century and lasting until the 20th, produced racialised hierarchies across the continent, shaping North Africa into a comparably privileged space proximate to ‘Arabness’. This was a racialised division based on a civilisational narrative that saw Arabs as superior, but more importantly a political economic division resulting from the slave trade routes that produced huge profits for North Africa and the Middle East. In the contemporary moment, these racialised hierarchies are bound up in political economic dependency on the Arab Gulf states, who are themselves dependent on resource extraction, land grabbing and privatisation across the entire African continent.  ‘The Cairo–Cape Town Highway connects Egypt to African markets viewed as “untapped”, invoking notions steeped in extraction’ However, this imaginary conjured by the Cairo–Cape Town Highway is countered by a network of streets scattered across Africa that traces the web of Egyptian Pan‑African solidarity across the continent. In Lusaka in Zambia, you might find yourself on Nasser Road, as you might in Mwanza in Tanzania or Luanda in Angola. In Mombasa in Kenya, you might be driving down Abdel Nasser Road; in Kampala in Uganda, you might find yourself at Nasser Road University; and in Tunis in Tunisia, you might end up on Gamal Abdel Nasser Street. These street names are a reference to Gamal Abdel Nasser, Egypt’s first postcolonial leader and president between 1956 and 1970.  Read against the contemporary Cairo–Cape Town Highway, these place names signal a different form of connection that brings to life Egyptian Pan‑Africanism, when solidarity was the hegemonic force connecting the continent, coming up against the notion of a natural or timeless ‘great divide’ within Africa. From the memoirs of Egyptian officials who were posted around Africa as conduits of solidarity, to the broadcasts of Radio Cairo that were heard across the continent, to the various conferences attended by anticolonial movements and postcolonial states, Egypt’s orientation towards Pan‑Africanism, beginning in the early 20th century and lasting until the 1970s, was both material and ideological. Figures and movements forged webs of solidarity with their African comrades, imagining an Africa that was united through shared commitments to ending colonialism and capitalist extraction.  The route between Cape Town in South Africa and Cairo in Egypt has long occupied the colonial imaginary. In 1930, Margaret Belcher and Ellen Budgell made the journey, sponsored by car brand Morris and oil company Shell Credit: Fox Photos / Getty The pair made use of the road built by British colonisers in the 19th century, and which forms the basis for the current Cairo–Cape Town Highway. The road was preceded by the 1874 Cape to Cairo Railway project, which connected the colonies of the British Empire Credit: Library of Congress, Geography and Map Division This network of eponymous streets represents attempts to inscribe anticolonial power into the materiality of the city. Street‑naming practices are one way in which the past comes into the present, ‘weaving history into the geographic fabric of everyday life’, as geographer Derek Alderman wrote in his 2002 essay ‘Street Names as Memorial Arenas’. In this vein, the renaming of streets during decolonisation marked a practice of contesting the production of colonial space. In the newly postcolonial city, renaming was a way of ‘claiming the city back’, Alderman continues. While these changes may appear discursive, it is their embedding in material spaces, through signs and maps, that make the names come to life; place names become a part of the everyday through sharing addresses or giving directions. This quality makes them powerful; consciously or unconsciously, they form part of how the spaces of the city are navigated.  These are traces that were once part of a dominant historical narrative; yet when they are encountered in the present, during a different historical moment, they no longer act as expressions of power but instead conjure up a moment that has long passed. A street in Lusaka named after an Egyptian general made more sense 60 years ago than it does today, yet contextualising it recovers a marginalised history of Egyptian Pan‑Africanism.  Markers such as street names or monuments are simultaneously markers of anticolonial struggle as well as expressions of state power – part of an attempt, by political projects such as Nasser’s, to exert their own dominance over cities, towns and villages. That such traces are expressions of both anticolonial hopes and postcolonial state power produces a sense of tension within them. For instance, Nasser’s postcolonial project in Egypt was a contradictory one; it gave life to anticolonial hopes – for instance by breaking away from European capitalism and embracing anticolonial geopolitics – while crushing many parts of the left through repression, censorship and imprisonment. Traces of Nasser found today inscribe both anticolonial promises – those that came to life and those that did not – while reproducing postcolonial power that in most instances ended in dictatorship.  Recent efforts to complete the route build on those of the post‑independence era – work on a section north of Nairobi started in 1968 Credit: Associated Press / Alamy The Trans‑African Highway network was conceived in 1970 in the spirit of Pan‑Africanism At that time, the routes did not extend into South Africa, which was in the grip of apartheid. The Trans‑African Highway initiative was motivated by a desire to improve trade and centre cultural links across the continent – an ambition that was even celebrated on postage stamps There have been long‑standing debates about the erasure of the radical anticolonial spirit from the more conservative postcolonial states that emerged; the promises and hopes of anticolonialism, not least among them socialism and a world free of white supremacy, remain largely unrealised. Instead, by the 1970s neoliberalism emerged as a new hegemonic project. The contemporary instantiation of Cape to Cairo highlights just how pervasive neoliberal logics continue to be, despite multiple global financial crises and the 2011 Egyptian revolution demanding ‘bread, freedom, social justice’.  But the network of streets named after anticolonial figures and events across the world is testament to the immense power and promise of anticolonial revolution. Most of the 20th century was characterised by anticolonial struggle, decolonisation and postcolonial nation‑building, as nations across the global south gained independence from European empire and founded their own political projects. Anticolonial traces, present in street and place names, point to the possibility of solidarity as a means of reorienting colonial geographies. They are a reminder that there have been other imaginings of Cape to Cairo, and that things can be – and have been – otherwise. 2025-06-13 Kristina Rapacki Share

Insights Learning to Lead in the Digital Age: The AI Readiness Reflection As the race to integrate generative AI accelerates, organizations face a dual challenge: fostering tech-savviness across teams while developing next-generation leadership competencies. These are critical to ensuring that “everyone” in the organization is prepared for continuous adaptation and change. This AI Readiness Reflection is designed to help you assess where your leaders stand today and identify the optimal path to build the digital knowledge, mindset, skills, and leadership capabilities required to thrive in the future. Take the assessment now to discover how your current practices align with AI maturity—and gain actionable insights tailored to your organization’s readiness level. To download the full report, tell us a bit about yourself. 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To opt-out, please visit our Privacy Policy. Digital Intelligence Share this resource Share on LinkedIn Share on Facebook Share on X Share on WhatsApp Email this Page Connect with us Change isn’t easy, but we can help. Together we’ll create informed and inspired leaders ready to shape the future of your business. Contact us Latest Insights Strategic Alignment Harvard Business Publishing Unveils Harvard Business Impact as New Brand for Corporate Learning and Education Units Harvard Business Publishing announced the launch of Harvard Business Impact, a new brand identity for… Read more: Harvard Business Publishing Unveils Harvard Business Impact as New Brand for Corporate Learning and Education Units News Digital Intelligence Succeeding in the Digital Age: Why AI-First Leadership Is Essential While AI makes powerful operational efficiencies possible, it cannot yet replace the creativity, adaptability, and… Read more: Succeeding in the Digital Age: Why AI-First Leadership Is Essential Perspectives Digital Intelligence 4 Keys to AI-First Leadership: The New Imperative for Digital Transformation AI has become a defining force in reshaping industries and determining competitive advantage. 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Insights Leadership Fitness Behavioral Assessment In our study, “Leadership Fitness: Developing the Capacity to See and Lead Differently Amid Complexity,” we identified four dimensions of leadership fitness that reframe how leaders see their environment as well as how they can lead differently through it. To help you evaluate your organization’s leadership maturity, we’ve created a tool to measure your leaders’ leadership fitness. Download the assessment today to uncover your score, and if desired, connect with one of our experts for personalized insights based on your results. To download the full report, tell us a bit about yourself. 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To opt-out, please visit our Privacy Policy. Talent Management Share this resource Share on LinkedIn Share on Facebook Share on X Share on WhatsApp Email this Page Connect with us Change isn’t easy, but we can help. Together we’ll create informed and inspired leaders ready to shape the future of your business. Contact us Latest Insights Strategic Alignment Harvard Business Publishing Unveils Harvard Business Impact as New Brand for Corporate Learning and Education Units Harvard Business Publishing announced the launch of Harvard Business Impact, a new brand identity for… Read more: Harvard Business Publishing Unveils Harvard Business Impact as New Brand for Corporate Learning and Education Units News Digital Intelligence Succeeding in the Digital Age: Why AI-First Leadership Is Essential While AI makes powerful operational efficiencies possible, it cannot yet replace the creativity, adaptability, and… Read more: Succeeding in the Digital Age: Why AI-First Leadership Is Essential Perspectives Digital Intelligence 4 Keys to AI-First Leadership: The New Imperative for Digital Transformation AI has become a defining force in reshaping industries and determining competitive advantage. To support… Read more: 4 Keys to AI-First Leadership: The New Imperative for Digital Transformation Infographic Talent Management Leadership Fitness Behavioral Assessment In our study, “Leadership Fitness: Developing the Capacity to See and Lead Differently Amid Complexity,”… Read more: Leadership Fitness Behavioral Assessment Job Aid The post Leadership Fitness Behavioral Assessment appeared first on Harvard Business Impact.

Insights Succeeding in the Digital Age: Why AI-First Leadership Is Essential While AI makes powerful operational efficiencies possible, it cannot yet replace the creativity, adaptability, and contextual understanding that humans bring to strategic decision making. Effective AI integration requires leaders who can act as bridges between organizational goals and AI capabilities and then inspire their teams to trust and adopt AI tools to help achieve those goals. To download the full report, tell us a bit about yourself. First Name * Last Name * Job Title * Organization * Business Email * Country * — Please Select — United States United Kingdom Afghanistan Aland Islands Albania Algeria American Samoa Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory Brunei Darussalam Bulgaria Burkina Faso Burundi Cambodia Cameroon Canada Cape Verde Cayman Islands Central African Republic Chad Chile China Christmas Island Cocos (Keeling) Islands Colombia Comoros Congo Congo, The Democratic Republic of Cook Islands Costa Rica Cote d’Ivoire Croatia Cuba Cyprus Czech Republic Denmark Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Falkland Islands (Malvinas) Faroe Islands Fiji Finland France French Guiana French Polynesia French Southern Territories Gabon Gambia Georgia Germany Ghana Gibraltar Greece Greenland Grenada Guadeloupe Guam Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard Island and McDonald Islands Holy See (Vatican City State) Honduras Hong Kong Hungary Iceland India Indonesia Iran, Islamic Republic of Iraq Ireland Isle of Man Israel Italy Jamaica Japan Jersey Jordan Kazakhstan Kenya Kiribati Korea, Democratic People’s Republic Korea, Republic of Kuwait Kyrgyzstan Lao People’s Democratic Republic Latvia Lebanon Lesotho Liberia Libyan Arab Jamahiriya Liechtenstein Lithuania Luxembourg Macao Macedonia The Former Yugoslav Republic Madagascar Malawi Malaysia Maldives Mali Malta Marshall Islands Martinique Mauritania Mauritius Mayotte Mexico Micronesia, Federated States of Moldova, Republic of Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar Namibia Nauru Nepal Netherlands Netherlands Antilles New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island Northern Mariana Islands Norway Oman Pakistan Palau Palestinian Territory,Occupied Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Puerto Rico Qatar Reunion Romania Russian Federation Rwanda Saint Helena Saint Kitts and Nevis Saint Lucia Saint Pierre and Miquelon Saint Vincent and the Grenadines Samoa San Marino Sao Tome and Principe Saudi Arabia Senegal Serbia Serbia and Montenegro Seychelles Sierra Leone Singapore Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia & Sandwich Islands Spain Sri Lanka Sudan Suriname Svalbard and Jan Mayen Swaziland Sweden Switzerland Syrian Arab Republic Taiwan Tajikistan Tanzania, United Republic of Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu Uganda Ukraine United Arab Emirates United States Minor Outlying Islands Uruguay Uzbekistan Vanuatu Venezuela Viet Nam Virgin Islands, British Virgin Islands, U.S. Wallis and Futuna Western Sahara Yemen Zambia Zimbabwe By checking this box, you agree to receive emails and communications from Harvard Business Impact. To opt-out, please visit our Privacy Policy. Digital IntelligenceLeadership Development Share this resource Share on LinkedIn Share on Facebook Share on X Share on WhatsApp Email this Page Connect with us Change isn’t easy, but we can help. Together we’ll create informed and inspired leaders ready to shape the future of your business. Contact us Latest Insights Strategic Alignment Harvard Business Publishing Unveils Harvard Business Impact as New Brand for Corporate Learning and Education Units Harvard Business Publishing announced the launch of Harvard Business Impact, a new brand identity for… Read more: Harvard Business Publishing Unveils Harvard Business Impact as New Brand for Corporate Learning and Education Units News Digital Intelligence Succeeding in the Digital Age: Why AI-First Leadership Is Essential While AI makes powerful operational efficiencies possible, it cannot yet replace the creativity, adaptability, and… Read more: Succeeding in the Digital Age: Why AI-First Leadership Is Essential Perspectives Digital Intelligence 4 Keys to AI-First Leadership: The New Imperative for Digital Transformation AI has become a defining force in reshaping industries and determining competitive advantage. To support… Read more: 4 Keys to AI-First Leadership: The New Imperative for Digital Transformation Infographic Talent Management Leadership Fitness Behavioral Assessment In our study, “Leadership Fitness: Developing the Capacity to See and Lead Differently Amid Complexity,”… Read more: Leadership Fitness Behavioral Assessment Job Aid The post Succeeding in the Digital Age: Why AI-First Leadership Is Essential appeared first on Harvard Business Impact.

May 30, 20252 min readSahara Dust Clouds Are Heading to Florida and BeyondClouds of dust blown off the Saharan Desert into the southeastern U.S. could affect local weather and make sunrises and sunsets particularly vividBy Meghan Bartels edited by Dean VisserEach year, seasonal winds carry tens of millions of tons of Saharan dust across the Atlantic and beyond. On February 18, 2021, NOAA-20’s VIIRS captured a dramatic display of airborne dust. NASA Earth Observatory image by Lauren Dauphin, using VIIRS data from NASA EOSDIS LANCE, GIBS/Worldview, and the Suomi National Polar-orbiting PartnershipClouds of dust drifting from the Sahara Desert over the Atlantic Ocean could make for unusual-looking sunrises and sunsets, as well as potentially drier weather, over Florida and parts of the southeastern U.S. in the coming days.What’s HappeningBetween late spring and early fall, dust from the Saharan gets blown out over the Atlantic Ocean every three to five days. When conditions are right, air masses that are filled with this dust can make it across the thousands of miles required to reach North America. Meteorologists call this type of air mass the Saharan Air Layer, or SAL.On supporting science journalismIf you're enjoying this article, consider supporting our award-winning journalism by subscribing. By purchasing a subscription you are helping to ensure the future of impactful stories about the discoveries and ideas shaping our world today.Currently, on Friday, a thin SAL is dispersing over Florida, says Ana Torres-Vazquez, a meteorologist at the National Weather Service’s Miami office, who adds that this could interfere with some storms carried into the peninsula by a cold front on Saturday. Another layer of dust—this one thicker and denser—may then blow in next week, although that forecast is currently less certain, Torres-Vazquez notes.It’s worth noting that the Atlantic hurricane season officially begins on June 1. In general, the SAL tends to dry the atmosphere it drifts through—so some scientists think these dust clouds may actually impede hurricane development. For now, however, forecasters aren’t expecting any tropical storms to develop in the Atlantic within the coming week.Sunrise, SunsetThe effect that will be most noticeable to local residents as the dust lingers might be unusual sunrises and sunsets.“When you have Saharan dust or any other kind of particulate, if the sun is coming in at an angle, like during sunrise or sunset,” Torres-Vazquez says, “it can hit those particulates that are close to the ground just right and result in those different, kind of orangey-reddish colors.”Other parts of the country might also see enhanced sunrises and sunsets during the coming days from a different kind of particulate—wildfire smoke. Canada is experiencing yet another brutal year for wildfires, with nearly 700,000 hectares, or more than 2,500 square miles, burned to date.Right now fires are particularly bad in the provinces of Saskatchewan and Manitoba, in part because of high temperatures stuck over central Canada. Smoke from these blazes is expected to reach U.S. states, including Minnesota, Wisconsin, Illinois and Michigan, in the coming days.Depending on how close the dust and smoke get to Earth’s surface, these kinds of particulate matter can be harmful to people’s health, particularly for people who are very young or very old and those who have asthma or heart or lung disease. The Air Quality Index can help you gauge whether you should take any precautions.

In 2003, engineers from Germany and Switzerland began building a bridge across the Rhine River simultaneously from both sides. Months into construction, they found that the two sides did not meet. The German side hovered 54 centimeters above the Swiss side. The misalignment occurred because the German engineers had measured elevation with a historic level of the North Sea as its zero point, while the Swiss ones had used the Mediterranean Sea, which was 27 centimeters lower. We may speak colloquially of elevations with respect to “sea level,” but Earth’s seas are actually not level. “The sea level is varying from location to location,” says Laura Sanchez, a geodesist at the Technical University of Munich in Germany. (Geodesists study our planet’s shape, orientation, and gravitational field.) While the two teams knew about the 27-centimeter difference, they mixed up which side was higher. Ultimately, Germany lowered its side to complete the bridge.  To prevent such costly construction errors, in 2015 scientists in the International Association of Geodesy voted to adopt the International Height Reference Frame, or IHRF, a worldwide standard for elevation. It’s the third-dimensional counterpart to latitude and longitude, says Sanchez, who helps coordinate the standardization effort.  Now, a decade after its adoption, geodesists are looking to update the standard—by using the most precise clock ever to fly in space. That clock, called the Atomic Clock Ensemble in Space, or ACES, launched into orbit from Florida last month, bound for the International Space Station. ACES, which was built by the European Space Agency, consists of two connected atomic clocks, one containing cesium atoms and the other containing hydrogen, combined to produce a single set of ticks with higher precision than either clock alone.  Pendulum clocks are only accurate to about a second per day, as the rate at which a pendulum swings can vary with humidity, temperature, and the weight of extra dust. Atomic clocks in current GPS satellites will lose or gain a second on average every 3,000 years. ACES, on the other hand, “will not lose or gain a second in 300 million years,” says Luigi Cacciapuoti, an ESA physicist who helped build and launch the device. (In 2022, China installed a potentially stabler clock on its space station, but the Chinese government has not publicly shared the clock’s performance after launch, according to Cacciapuoti.)  From space, ACES will link to some of the most accurate clocks on Earth to create a synchronized clock network, which will support its main purpose: to perform tests of fundamental physics.  But it’s of special interest for geodesists because it can be used to make gravitational measurements that will help establish a more precise zero point from which to measure elevation across the world. Alignment over this “zero point” (basically where you stick the end of the tape measure to measure elevation) is important for international collaboration. It makes it easier, for example, to monitor and compare sea-level changes around the world. It is especially useful for building infrastructure involving flowing water, such as dams and canals. In 2020, the international height standard even resolved a long-standing dispute between China and Nepal over Mount Everest’s height. For years, China said the mountain was 8,844.43 meters; Nepal measured it at 8,848. Using the IHRF, the two countries finally agreed that the mountain was 8,848.86 meters.  A worker performs tests on ACES at a cleanroom at the Kennedy Space Center in Florida.ESA-T. PEIGNIER To create a standard zero point, geodesists create a model of Earth known as a geoid. Every point on the surface of this lumpy, potato-shaped model experiences the same gravity, which means that if you dug a canal at the height of the geoid, the water within the canal would be level and would not flow. Distance from the geoid establishes a global system for altitude. However, the current model lacks precision, particularly in Africa and South America, says Sanchez. Today’s geoid has been built using instruments that directly measure Earth’s gravity. These have been carried on satellites, which excel at getting a global but low-resolution view, and have also been used to get finer details via expensive ground- and airplane-based surveys. But geodesists have not had the funding to survey Africa and South America as extensively as other parts of the world, particularly in difficult terrain such as the Amazon rainforest and Sahara Desert.  To understand the discrepancy in precision, imagine a bridge that spans Africa from the Mediterranean coast to Cape Town, South Africa. If it’s built using the current geoid, the two ends of the bridge will be misaligned by tens of centimeters. In comparison, you’d be off by at most five centimeters if you were building a bridge spanning North America.  To improve the geoid’s precision, geodesists want to create a worldwide network of clocks, synchronized from space. The idea works according to Einstein’s theory of general relativity, which states that the stronger the gravitational field, the more slowly time passes. The 2014 sci-fi movie Interstellar illustrates an extreme version of this so-called time dilation: Two astronauts spend a few hours in extreme gravity near a black hole to return to a shipmate who has aged more than two decades. Similarly, Earth’s gravity grows weaker the higher in elevation you are. Your feet, for example, experience slightly stronger gravity than your head when you’re standing. Assuming you live to be about 80 years old, over a lifetime your head will age tens of billionths of a second more than your feet.  A clock network would allow geodesists to compare the ticking of clocks all over the world. They could then use the variations in time to map Earth’s gravitational field much more precisely, and consequently create a more precise geoid. The most accurate clocks today are precise enough to measure variations in time that map onto centimeter-level differences in elevation.  “We want to have the accuracy level at the one-centimeter or sub-centimeter level,” says Jürgen Müller, a geodesist at Leibniz University Hannover in Germany. Specifically, geodesists would use the clock measurements to validate their geoid model, which they currently do with ground- and plane-based surveying techniques. They think that a clock network should be considerably less expensive. ACES is just a first step. It is capable of measuring altitudes at various points around Earth with 10-centimeter precision, says Cacciapuoti. But the point of ACES is to prototype the clock network. It will demonstrate the optical and microwave technology needed to use a clock in space to connect some of the most advanced ground-based clocks together. In the next year or so, Müller plans to use ACES to connect to clocks on the ground, starting with three in Germany. Müller’s team could then make more precise measurements at the location of those clocks. These early studies will pave the way for work connecting even more precise clocks than ACES to the network, ultimately leading to an improved geoid. The best clocks today are some 50 times more precise than ACES. “The exciting thing is that clocks are getting even stabler,” says Michael Bevis, a geodesist at Ohio State University, who was not involved with the project. A more precise geoid would allow engineers, for example, to build a canal with better control of its depth and flow, he says. However, he points out that in order for geodesists to take advantage of the clocks’ precision, they will also have to improve their mathematical models of Earth’s gravitational field.  Even starting to build this clock network has required decades of dedicated work by scientists and engineers. It took ESA three decades to make a clock as small as ACES that is suitable for space, says Cacciapuoti. This meant miniaturizing a clock the size of a laboratory into the size of a small fridge. “It was a huge engineering effort,” says Cacciapuoti, who has been working on the project since he began at ESA 20 years ago.  Geodesists expect they’ll need at least another decade to develop the clock network and launch more clocks into space. One possibility would be to slot the clocks onto GPS satellites. The timeline depends on the success of the ACES mission and the willingness of government agencies to invest, says Sanchez. But whatever the specifics, mapping the world takes time.

Technology  Rate this post Africa is a large and beautiful continent. It has many countries, cultures, and people. Each country is unique. Some are small, while others are very large. In this article, we will explore how many countries are in Africa. We will also learn some interesting facts about them. How Many Countries Are in Africa in 2025? As of 2025, Africa has 54 recognized countries. These countries are members of the African Union (AU). Some sources may list 55 or 56. That is because of disputed territories. However, the official number is 54 countries. What Are These Countries? Here is a list of all 54 African countries: Algeria Angola Benin Botswana Burkina Faso Burundi Cape Verde (Cabo Verde) Cameroon Central African Republic Chad Comoros Democratic Republic of the Congo Republic of the Congo Cote d’Ivoire (Ivory Coast) Djibouti Egypt Equatorial Guinea Eritrea Eswatini (formerly Swaziland) Ethiopia Gabon Gambia Ghana Guinea Guinea-Bissau Kenya Lesotho Liberia Libya Madagascar Malawi Mali Mauritania Mauritius Morocco Mozambique Namibia Niger Nigeria Rwanda Sao Tome and Principe Senegal Seychelles Sierra Leone Somalia South Africa South Sudan Sudan Tanzania Togo Tunisia Uganda Zambia Zimbabwe Are There Any Disputed Regions? Yes, there are. Some regions are not fully recognized. The most well-known is Western Sahara. It wants independence. Some countries support it. Others do not. It is a disputed region. That’s why numbers may vary across sources. What Is the African Union? The African Union (AU) is like a family of African countries. It helps them work together. The AU has 55 members. This includes Western Sahara. That is why some people count 55 countries. But the United Nations recognizes 54 countries in Africa. How Is Africa Divided Geographically? Africa is usually divided into five regions: North Africa – Includes Egypt, Algeria, Libya, Morocco, Tunisia, and Sudan. West Africa – Includes Nigeria, Ghana, Senegal, and many more. Central Africa – Includes Cameroon, Chad, and Congo. East Africa – Includes Kenya, Ethiopia, and Tanzania. Southern Africa – Includes South Africa, Zimbabwe, and Botswana. These regions are based on geography and culture. Each region has its languages and traditions. Which Is the Largest Country in Africa? Algeria is the largest country by land area. It is in North Africa. It covers over 2.3 million square kilometers. Which Is the Smallest Country in Africa? Seychelles is the smallest African country. It is a group of islands. It is located in the Indian Ocean. It has a population of less than 100,000 people. What Is the Most Populated Country in Africa? Nigeria has the most people in Africa. It has over 223 million people in 2025. That is a huge number. Nigeria is also a strong economy in the continent. Which Country Is the Youngest? South Sudan is the newest African country. It became independent in 2011. It was part of Sudan before. How Many Languages Are Spoken in Africa? Africa is full of languages. Over 2,000 languages are spoken across the continent. Some countries have more than 100 languages. What Are the Most Spoken Languages? Some common languages in Africa include: Arabic (mainly in North Africa) Swahili (East Africa) Hausa (West Africa) Amharic (Ethiopia) English and French (used in many countries) These languages help people from different tribes talk to each other. What Religions Are Practiced in Africa? Africa has many religions. The most common are: Islam – followed mostly in North and West Africa Christianity – followed in most parts of Sub-Saharan Africa Traditional African Religions – still practiced in rural areas Religion plays an important role in African life. What Makes Africa Special? Africa is the second-largest continent. It is rich in culture, wildlife, and history. It has deserts, rainforests, and savannas. Africa is home to the Sahara Desert, the Nile River, and Mount Kilimanjaro. Is Africa Growing Fast? Yes, very fast. Africa has one of the youngest populations in the world. Many people are under 25. Cities are growing. Technology is spreading. New businesses are starting. Africa is changing quickly. Top Cities in Africa Some of the largest and busiest cities are: Lagos (Nigeria) Cairo (Egypt) Johannesburg (South Africa) Nairobi (Kenya) Addis Ababa (Ethiopia) These cities are centers of business, culture, and government. Tourism in Africa Africa has many tourist spots. People visit for safaris, beaches, and ancient places. Some famous places include: Pyramids of Egypt Serengeti National Park Victoria Falls Table Mountain Sahara Desert Tourism is growing fast in many African countries. Conclusion Africa is a vibrant and powerful continent. It has 54 unique and independent countries. Each one adds value to the continent. From deserts to cities, from languages to religions, Africa has it all. Knowing how many countries are in Africa helps us understand its diversity. Africa will continue to grow in 2025 and beyond. Tech World TimesTech World Times (TWT), a global collective focusing on the latest tech news and trends in blockchain, Fintech, Development & Testing, AI and Startups. If you are looking for the guest post then contact at techworldtimes@gmail.com

Get the Popular Science daily newsletter💡 Breakthroughs, discoveries, and DIY tips sent every weekday. A smelly, sometimes toxic “killer belt of seaweed” might put a damper on Floridians’ Memorial Day weekend plans. Sargassum is back just in time for the unofficial start of summer and this year’s influx of the brown algae would be record breaking at 31 million tons.  What is Sargassum? Sargassum is a genus of large brown seaweed. As a seaweed, it is also a type of algae. It floats along the ocean in island-like masses and does not attach to the seafloor the way that kelp does.  According to NOAA, this brown algae is abundant in the world’s oceans. It has many leafy appendages, branches, and its signature berry-like structures. These round “berries” are actually gas-filled structures called pneumatocysts. They are primarily filled with oxygen and add buoyancy to the plant structure and allow it to float on the surface of the water, similar to a life jacket.  Importantly, Sargassum provides food and a floating habitat for several marine species including various fishes, sea turtles, marine birds, crabs, and shrimp. Some animals, like the sargassum fish will spend their whole lives around Sargassum’s gas-filled floats and the seaweed is a nursery area for some commercially important fishes, including mahi mahi, jacks, and amberjacks. Smaller fishes, such as filefishes and triggerfishes, reside in and among brown Sargassum. CREDIT: NOAA/Life on the Edge Exploration. Is it harmful to humans? When Sargassum washes up on shore, it begins to rot. That rotting triggers the production of hydrogen sulfide gas, which smells like rotten eggs. These odors themselves are not harmful to humans when inhaled in well ventilated areas like the beach. But the gases can accumulate enough to cause harm if they are breathed in within enclosed spaces.  “Hydrogen sulfide can irritate the eyes, nose, and throat,” writes Florida’s Department of Health in St. John’s County. “If you have asthma or other breathing illnesses, you will be more sensitive to hydrogen sulfide. You may have trouble breathing after you inhale it.” Coming into contact with the jellyfish or other stinging organisms embedded in the rotting seaweed can cause rashes on the skin. Any workers for volunteers collecting and transporting the seaweed should wear gloves, boots, and gas-filter half masks for protection. 2025’s mega bloom In Florida and the Caribbean, Sargassum season runs from April to August, with June and July as the peak months for setting in along the shoreline. However, the blobs have been spotted along shorelines since March this year. The bloom has already broken its own size record set in June 2022 by 40 percent–and is still growing. The annual bloom now stretches over 5,500 miles of ocean between Africa and the Caribbean and weighs an estimated 31 million tons.  “Sargassum goes from being a very beneficial resource of the North Atlantic to becoming what we refer to as … a harmful algal bloom, when it comes ashore in excessive biomass,” Brian LaPointe, a research professor at Florida Atlantic University’s Harbor Branch Oceanographic Institute, told CNN. “What we have seen since 2011 are excessive inundation events all around the Caribbean region, the Gulf, as well as the South Florida region.” Why is this year’s bloom so big? Increasing ocean temperatures due to climate change is one of the reasons for such a large bloom. The Atlantic and waters around Florida have seen record-breaking high temperatures in recent years, creating ideal conditions for the seaweed to thrive. The excess nitrogen in the water from the burning of fossil fuels or dust from the Sahara is believed to be one of the forces behind this supercharged bloom. An experimental tracking map from NOAA for May 6 through 12, showing where sargassum is likely to wash ashore in Florida. CREDIT: NOAA Scientists can use satellites to track the seaweed and issue warnings if needed. The CariCOOS Sargassum map shows that the bulk of the bloom is currently east of Puerto Rico, but it has already been spotted along Florida’s Atlantic coast. NOAA encourages anyone who encounters Sargassum on the beach to report it with this form.

If the year 2025 has had a message for developing countries, it’s this: “You’re on your own.”Most notably, the Trump administration began with an unprecedented and ongoing assault on foreign aid, including global health programs. But there have been further ill omens. Other rich countries, including the UK and France, followed the US example by cutting their own aid programs as well. Meanwhile, President Donald Trump’s tariff campaign has hit poor countries that had been achieving export-driven growth, like Bangladesh, especially hard.RelatedThe worst thing Trump has done so farIf there’s a silver lining for the Global South, it’s that being on their own in 2025 means something very different than what it meant in, say, 1990. Countries where poverty was once near-universal, like India or Indonesia, are now considered middle-income. Some populous countries in sub-Saharan Africa, like Kenya or Nigeria, are, if not completely politically stable, now possessed of enough real state capacity to try ambitious projects like universal health coverage.The resources available to these nations are still highly limited by rich-world standards. But they’re still enough to achieve very impressive feats, and I recently heard of an intriguing project that could serve as a perfect test case. If it works, it could show that major international health projects, saving hundreds of thousands of lives, can be funded largely by the countries they’re meant to help, rather than by forces of philanthropy and foreign aid that have suddenly become unreliable.Neonatal sepsis: When babies’ infections go very, very badlyIt’s called NeoTest.The program targets an extremely common and preventable cause of death in young infants: neonatal sepsis. Sepsis is a catch-all term for infections that provoke an overwhelming immune response, damaging internal organs, and in the worst cases, leading to death. Sepsis can in principle be caused by anything — a virus, a fungus, a protozoa — but in practice, most infants who get it get it from a bacterial infection.In one way, that’s good: We have antibiotics! In another way, it’s bad: The risk of antibiotic resistance means you don’t want to overuse them. The challenge, then, is to match antibiotics to the babies who need them the most.The tests we have now for bacterial sepsis in infants are slow and expensive. The main technique is “blood culturing,” which involves taking blood from the patient, putting it in a liquid “culture” that reacts if bacteria are present, and waiting to see the reaction show up. This is expensive and often takes two to three days, potentially delaying life-saving treatment. It also has very high “false negative” rates, with studies showing that a large share of neonatal sepsis cases occur in babies who test negative.This story was first featured in the Future Perfect newsletter.Sign up here to explore the big, complicated problems the world faces and the most efficient ways to solve them. Sent twice a week.So our targeting of antibiotics to babies is currently bad, with the result that hundreds of thousands of babies die every year from sepsis. The estimates we have on the toll of neonatal sepsis aren’t precise, but the best figure I’ve seen, from the World Health Organization (WHO), is a range of 400,000 to 700,000 deaths a year. That’s in the same ballpark as malaria (600 to 700,000 a year) and HIV/AIDS (630,000 deaths in 2023).Other studies go lower (more like 200,000) but, because they exclude infant deaths from pneumonia-caused sepsis, underestimate the number of deaths that could be saved by better targeting antibiotics to babies.The team behind NeoTest — which includes physician and global health research Akhil Bansal, Center for Global Development head Rachel Glennerster, economist and House of Lords member Jim O’Neill, and Nobel-winning economist Michael Kremer — aims to improve that targeting by getting a better test, one that gives results within minutes and is cheap to produce.If you fund it, they will comeThe NeoTest team does not, itself, consist of medical test manufacturers. But in Glennerster and Kremer, it includes two of the inventors of a tool called an “advance market commitment” (AMC).AMCs are a way to communicate to companies that there’s a big market for a product which doesn’t yet exist. The participants, which can include governments or other businesses or philanthropists, commit to buying a set amount of the new product, at a set price, from any manufacturers who meet the deal’s specifications. The hope is that this provides an incentive for manufacturers to develop the product, because they know for a fact there will be demand for it.It’s worked before. The first AMC, for better vaccines against pneumococcal bacteria at a time when that disease was killing as many as 1 million children a year, resulted in three new vaccines being developed, and in the number of vaccine doses growing from just 3 million in 2010 to around 150 million in 2016. By one estimate from Kremer and co-authors, the new vaccines enabled by the AMC saved some 700,000 lives between 2010 and 2020.NeoTest is an attempt to put together funds — about $120 million in total — for an advance market commitment for a better neonatal sepsis test.More famously, Operation Warp Speed, the US effort that got effective vaccines against Covid-19 on the market less than a year after the pandemic began, used a purchasing mechanism that worked quite a bit like an AMC. The government purchased hundreds of millions of doses from vaccine manufacturers months before the vaccines were in fact approved — giving the pharma firms confidence to start producing doses in large numbers, and encouraging them to keep up their R&D work.NeoTest is an attempt to put together funds — about $120 million in total — for an advance market commitment for a better neonatal sepsis test. Test manufacturers who are willing to sell for $8 per test ($5 funded by the AMC, $3 by the government of the country receiving the tests) would be guaranteed at least 24 million subsidized orders. Ideally, the test will settle at around $3 as a final price, with the initial subsidy helping fund initial costs associated with developing the tests and setting up manufacturing.A rapid test is not some outlandish dream. Neonatal sepsis experts have been saying we need better diagnostics for years; there’s a whole Neonatal Sepsis Diagnosis Working Group that puts out papers explaining the problem. The WHO has put together a detailed description of what a useful rapid test for sepsis might look like, including elements like the size of the blood draw required and the ideal wait for results.Rapid, point-of-care tests that can give answers in minutes are common at this point for viruses like Covid and the flu, and already exist for some bacterial infections like syphilis. But in part because neonatal sepsis is so concentrated in poor countries, developing a test for it hasn’t been a priority for profit-driven firms to date. Dangling $120 million in front of them might change that.This is a problem developing countries could solve as a groupOne of the most intriguing aspects of NeoTest to me is that Akhil Bansal, the physician who first devised the idea, is pitching it first to governments of middle- income countries (India, Kenya, South Africa, etc.) that might actually use the test in large numbers.$120 million is a decent sum, but not enormous for a global health project. The pneumococcal AMC, by contrast, was for $1.5 billion. And it’s totally within the budgets of some middle-income countries to contribute a portion of that $120 million, especially when the result is a product that will save the lives of thousands of babies every year in their country.Of course, money is money, and if any foreign aid professionals in upper-income countries or philanthropists reading this piece want to support NeoTest, they should — they’re still actively fundraising and are in need of support. The most important thing is that the problem gets solved.But I found the approach of going first to countries directly benefiting for funding intriguing, and surprisingly heartening at what is otherwise a dark time for global healthFor one thing, it’s remarkable and encouraging that enough middle-income countries have gotten to the point where funding an initiative like this is within their budgets. That wasn’t true 20 years ago.More importantly, though, it serves as a reminder that the work of development will continue with or without Western governments’ support. That support is invaluable, and I hope it returns. But the Global South is resilient, and increasingly shows an ability to solve big problems for itself.A version of this story originally appeared in the Future Perfect newsletter. Sign up here!You’ve read 1 article in the last monthHere at Vox, we're unwavering in our commitment to covering the issues that matter most to you — threats to democracy, immigration, reproductive rights, the environment, and the rising polarization across this country.Our mission is to provide clear, accessible journalism that empowers you to stay informed and engaged in shaping our world. 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