AI chatbots answered health questions warmly in every language, but the medical advice was much weaker in some. Doctors rated 1,008 answers; dangerous replies were 3.6% in English and 15.5% in Thai and Hebrew.
A protein inside brain cells can build a shell like a virus and carry a damaging protein into neighbouring cells. In fruit flies, blocking that shell improved movement and helped the flies live longer.
A new daily pill lowered harmful cholesterol by about 65%, well beyond the other pill options doctors use now. In a 301-person trial over eight weeks, the best rival treatment reached 37%.
Scientists switched off a gene that sheep need to build kidneys, so their fetuses grew none. Adding a few cells from another sheep into the very early embryo restored normal-looking kidneys by day 48 of pregnancy.
On small papaya farms in Kenya, moths that fly at night help the trees make fruit just as much as bees do by day. Researchers covered flowers only by day, or only by night, and the two groups' work added together.
When coral gets too hot, its different cell types break down in different ways, and only some recover. Researchers read the activity inside 20,000 single coral cells over seven hot days and 45 days of recovery.
Children's books about famous scientists often suggest scientific ability and curiosity are inborn, not built over time. Researchers read and coded 422 best-selling books covering 1,355 scientist characters.
Monkeys who take a small quick treat instead of a bigger later one may simply forget what they chose. When researchers showed the monkeys their choice again just before the reward arrived, the monkeys waited far more often.