A game-theory model shows that for large populations, cheap-to-file complaint systems that act only after many complaints are always more efficient; in New York's 311 heat and hot water data, 33% of complaints were duplicates and single complaints rarely led to inspections.

Among 524 new Nevada lawyers, a one standard deviation higher bar exam score went with at most a 4% better effectiveness rating from judges and almost none from peers. Bar scores explained no more than 12% of the variation in any rating.

GPT-4 posing as an average American tracked left-wing answers with a coefficient of 0.752, against 0.447 for real Americans in Pew data. Its default text leaned left on 13 of 19 themes, and it refused right-wing images on three topics.

In seven studies with 4,321 people, participants hid appearance goals behind health motives in public. In a Facebook study, 59.7% chose an appearance workout program when the choice was hidden, versus 39.3% when friends could see it.

In eight studies with 4,181 US adults, conspiracy believers overrated their own test performance, and although conspiracy claims won majority support only 12% of the time, believers thought they were in the majority 93% of the time.

Across seven studies, people rated donors who pick charities by cost-effectiveness as less moral and less desirable as friends than empathic donors. When told to make a good impression, 71% chose the empathic approach, against 57% without that prompt.

Households with a GLP-1 user cut grocery spending by 5.3% within six months (8.2% for higher-income homes), with savory snacks down 10.1% and fast-food and coffee shop spending down 8.0%; the changes faded when people stopped the drugs.