This is todays edition ofThe Download,our weekday newsletter that provides a daily dose of whats going on in the world of technology.Mice with two dads have been created using CRISPRWhats new: Mice with two fathers have been bornand have survived to adulthoodfollowing a complex set of experiments by a team in China. The researchers used CRISPR to create the mice, using a novel approach to target genes that normally need to be inherited from both male and female parents. They hope to use the same approach to create primates with two dads.Why it matters: Humans are off limits for now, but the work does help us better understand a strange biological phenomenon known as imprinting, which causes certain genes to be expressed differently depending on which parent they came from. Read the full story.Jessica HamzelouThree reasons Meta will struggle with community fact-checkingSarah Gilbert is research director for the Citizens and Technology Lab at Cornell University.Earlier this month, Mark Zuckerberg announced that Meta will cut back on its content moderation efforts and eliminate fact-checking in the US in favor of the more democratic approach that X (formerly Twitter) calls Community Notes.The move is raising alarm bells, and rightly so. Meta has left a trail of moderation controversies in its wake, and ending professional fact-checking creates the potential for misinformation and hate to spread unchecked.Im a community moderator who researches community moderation. Heres what Ive learned about the limitations of relying on volunteers for moderationand what Meta needs to do to succeed.MIT Technology Review Narrated: Is this the end of animal testing?Animal studies are notoriously bad at identifying human treatments. Around 95% of the drugs developed through animal research fail in people. But until recently there was no other option.Now organs on chips may offer a truly viable alternative. They look remarkably prosaic: flexible polymer rectangles about the size of a thumb drive. In reality theyre triumphs of bioengineering, intricate constructions furrowed with tiny channels that are lined with living human tissues. And as they continue to be refined, they could solve one of the biggest problems in medicine today.This is our latest story to be turned into a MIT Technology Review Narrated podcast, whichwere publishing each week on Spotify and Apple Podcasts. Just navigate to MIT Technology Review Narrated on either platform, and follow us to get all our new content as its released.The must-readsIve combed the internet to find you todays most fun/important/scary/fascinating stories about technology.1 DeepSeek has AI investors spookedTheyre worried theyve wasted their money after the Chinese startup proved that powerful models can be created on a shoestring. (NYT $)+ Its success has also shed light on how little we know about AIs power demands. (FT $)+ DeepSeeks rapid rise is great news for Chinas AI strategy. (WP $)+ How a top Chinese AI model overcame US sanctions. (MIT Technology Review)2 OpenAI has accused DeepSeek of using its AI models to train R1Just hours after Sam Altman claimed it was invigorating to have a new competitor. (FT $)+ DeepSeek has been telling some people that its made by Microsoft. (Fast Company $)+ Italy is investigating how the firm handles personal data in relation to GDPR. (TechCrunch)3 Alibaba claims its new AI model surpasses DeepSeeksThat was fast. (WSJ $)+ Heres what sets DeepSeek apart from its competition. (NBC News)4 RFK Jrs niece is trying to stop him being appointed the top US health officialShes shared private emails in which he makes false covid and vaccine claims. (STAT)+ His cousin has also denounced him as a predator. (NY Mag $)+ A weaker vaccine policy will lead to the resurgence of dangerous diseases. (The Atlantic $)+ Why childhood vaccines are a public health success story. (MIT Technology Review)5 Donald Trump has threatened new chip sanctionsIn a heavy-handed attempt to force manufacturers to relocate to the US. (WP $)6 Women seeking fertility treatment in the US are being left in the darkClinics dont publicly declare how many times egg retrieval has gone wrong. (Bloomberg $)+ Inside the strange limbo facing millions of IVF embryos. (MIT Technology Review)7 Spotify claims that streaming has made the world value musicIm not convinced artists will agree. (The Verge)8 Supersonic commercial flights could be staging a comebackMore than two decades after Concorde ceased operation. (New Scientist $)+ How rerouting planes to produce fewer contrails could help cool the planet. (MIT Technology Review)9 LinkedIn has booted AI-generated jobseekers off its platformTheir accounts were created by a company peddling AI agents. (404 Media)+ How one developer fought back against AI crawler bots. (Ars Technica)10 The future of food is bacteria and algaeMmm, delicious. (Undark)+ Would you eat dried microbes? This company hopes so. (MIT Technology Review)Quote of the dayI dont have technology. Ive never emailed or, what do you call it, Twittered.Actor Christopher Walken isnt a fan of modern gadgetry, he tells the Wall Street Journal.The big storyDeepfakes of your dead loved ones are a booming Chinese businessMay 2024Once a week, Sun Kai has a video call with his mother, and they discuss his day-to-day life. But Suns mother died five years ago, and the person hes talking to isnt actually a person, but a digital replica he made of her.There are plenty of people like Sun who want to use AI to preserve, animate, and interact with lost loved ones as they mourn and try to heal. The market is particularly strong in China, where at least half a dozen companies are now offering such technologies and thousands of people have already paid for them.But some question whether interacting with AI replicas of the dead is truly a healthy way to process grief, and its not entirely clear what the legal and ethical implications of this technology may be. Read the full story.Zeyi YangWe can still have nice thingsA place for comfort, fun and distraction to brighten up your day. (Got any ideas? Drop me a line or skeet em at me.)+ Happy Chinese New Year to all those who celebrate! + These robots do a passable job dancing to mark the celebration.+ If you havent seen A Real Pain in the theater yet, why not?+ Coolarchaeologists have uncovered an ancient Roman mask that may depict Medusa.