A frustrated man in a red shirt holds his head in stress against a neutral background.

Lose the AI Helper and Many People Stop Trying

Three randomized online experiments with 1,222 participants found that people who lost a chatbot’s help solved fewer fraction and reading problems than people who never had it. Direct-answer users fared worst, though that comparison was not randomized.

Portrait of a woman in gray with hands on neck, expressing worry and sadness.

A Cannabis-Like Drug Turned Up Threat Avoidance in Mice

Mice given a synthetic cannabinoid froze more and avoided a predator odor analog, and blocking output from fear-region somatostatin neurons prevented the avoidance boost. Whether any of this explains human cannabis anxiety is untested.

3D rendered abstract design featuring a digital brain visual with vibrant colors. A Misleading AI Summary Can Warp What You Remember

A Misleading AI Summary Can Warp What You Remember

Georgetown and University of Washington researchers found that AI video summaries omitted the crash itself in 95% of test cases, and one misleading detail was enough to warp what people remembered from an accident they had watched firsthand.

Creative surreal art featuring two women with large spherical white headwear touching foreheads.

Scientists Say the Brain Is Two Organs, Not One

Stanford researchers traced two separate progenitor cells in mouse embryos, one wiring up the thinking brain and the other the life support system of breathing and heartbeat, explaining why hindbrain neurons have been nearly impossible to grow in a lab.