Psilocybin, the active chemical in magic mushrooms, produced no hallucinations at very low doses. In 56 healthy adults, doses of 0.5 to 4 milligrams were noticeable but caused no visions and no drop in attention or memory.
A computer model was fed about a billion real particle collisions and told almost no physics. The fake collisions it then produced show the correct masses of several known particles, matching values physicists had already measured.
Leading AI chat models make mistakes when asked to repeat a piece of text word for word. On long, repetitive text, five top models copied it correctly less than half the time.
Young people who faced more threat, like violence at home, had a larger brain network that links thinking to body movement. Scans of 4,525 people aged 9 to 18 showed the network grew as threat rose.
People's taste for risk is not fixed. In a paid experiment where money grew in two different ways, participants shifted their risk-taking to nearly the level that grows wealth fastest over time.