Waterbeds that cool cows and heat houses

Cows can’t sweat but still give off a lot of energy as heat. A research farm in Bavaria is tapping it to warm buildings. Water-filled mats in stalls cool the animals when they lie down and store the warmth they exude. The technology is innovative but expensive: the system costs around €200,000. | Also on the show: Europe's AI offensive with Apertus, an open-source language model from Switzerland | Indian influencers explain science on YouTube | Plus: Cyberattacks already pose a real threat to hospitals, but could hackers also target heart implants?