Factify

1.5 billion people worldwide live in silence or near-silence. Science just found the switch to turn the sound back on — not with a device, but with their own biology 👇

Over 25,000 tiny hair cells exist inside the cochlea — the snail-shaped organ deep inside your inner ear. These cells detect sound and fire nerve signals directly to your brain. Once damaged by loud noise, ageing, or infection, they cannot regenerate. Until now. (medicaldaily) A UK company called Rinri Therapeutics developed Rincell-1 — a first-of-its-kind inner ear cell therapy derived from embryonic stem cells that differentiates into fully mature auditory neurons, physically reconnecting the broken circuitry inside the cochlea between damaged hair cells and the brainstem. (PubMed Central) Stem cells including pluripotent and adult stem cells have already demonstrated the ability to restore hearing in animal models — with human clinical translation now actively underway. (Drkumardiscovery) Hearing aids mask the silence. Stem cells end it. (Harvard Division of Sleep Medicine)

Your phone battery dies in 2 years. Your car battery lasts 5. Scientists just built one that outlasts your great-great-great-grandchildren — using something you can cook with tonight 👇

Researchers from the City University of Hong Kong and Southern University of Science and Technology have developed a revolutionary water-based battery whose electrolyte uses the exact same neutral mineral salts — magnesium and calcium — found in tofu brine. (PubMed Central) During testing the battery remained completely stable for 120,000 charge cycles — and at normal grid usage rates of one charge per day, researchers calculated it could theoretically operate for over 300 years without replacement. (Harvard Division of Sleep Medicine) Unlike lithium-ion batteries packed with flammable, toxic chemicals, the electrolyte is so completely harmless it could literally be used as tofu brine for home cooking — and safely discarded directly into the environment. (CDC) Lead researcher Professor Li Wei described it simply: "Traditional batteries are like running a marathon in acid rain. Our system is like running in perfect weather — the runner performs optimally far longer." (Battery Technology) The future of energy smells like dinner.

Every time you use the internet, data travels through massive buildings burning enormous amounts of energy. China just found a better way — and buried it under the sea 👇

China's Hainan Underwater Intelligent Computing Center is the world's first fully operational, commercially scaled subsea data center cluster — sitting on the floor of the South China Sea near Lingshui County off Hainan Island. (newatlas) The 1,300-tonne submarine data center cabin is submerged 35 metres underwater — using the ocean itself as a free, unlimited natural cooling system and saving 105,000 tonnes of freshwater and 122 million kilowatt-hours of electricity annually. (tomshardware) The facility is 40–60% more power-efficient than traditional land-based data centres. (lifeboat) Its computing power equals 30,000 high-end gaming PCs — processing 7,000 AI queries per second and 4 million high-resolution images in just 30 seconds. (newatlas) The internet just went underwater. And it's faster down there.

Rockets are loud, dangerous and waste 90% of their fuel just fighting gravity. So engineers asked — what if we just built a lift instead? 👇

A space elevator would replace the roar of rocket launches with the quiet hum of electric motors — a tether stretching from Earth's surface all the way to a counterweight in geostationary orbit, with mechanical climbers ascending and descending carrying cargo, satellites, and eventually people — entirely without rocket fuel. (HuffPost) Japan's Obayashi Corporation has a detailed plan using a nearly 60,000-mile carbon nanotube tether — strong enough to hold a 30-passenger climber travelling at 200 km/h, reaching geostationary orbit after a 7.5-day journey. (PubMed Central) A space elevator would reduce launch costs by a factor of 100 or more — making satellites launchable for a few hundred dollars per kilogram instead of tens of thousands. (HuffPost) Today three known materials are strong enough — carbon nanotubes, hexagonal boron nitride, and single crystal graphene — with graphene currently the most promising candidate. (Harvard Division of Sleep Medicine) The rocket age has an expiry date. The elevator is coming.