In World Values Survey data on about 58,000 people in 44 countries, those who called themselves not very or not at all happy were more likely to discuss politics with friends and urge others to vote or take political action.

When COVID-19 travel bans hit in March 2020, births fell in Canada and the US but not in comparable European countries. The gap implies about 970 births a month in Canada (3.2%) and 6,700 in the US (2.2%) are to people arriving from abroad.

A chapter in the Routledge Handbook of Homicide Studies counts 381 serial murderers between 2011 and 2021, down from a peak of 823, and credits surveillance, DNA technology, cell phones and better-connected police for ending the crime's heyday.

Across 61 societies, people were more comfortable with infection-risky contact, such as sharing a water bottle, and more likely to touch in greeting, the more they valued the other person; culture and disease history mattered mainly for close partners.

Five experiments with 2,800 people found that positive secrets, such as a planned proposal or surprise gift, boost feelings of energy compared with the same good news shared openly, because people choose to keep them freely.

Across four studies, "humorbragging" made job candidates seem both warmer and more competent: a humorbragging resume drew more recruiter interest, and humorbragging entrepreneurs secured more funding than those using other humor.

Across three UK studies with about 1,400 participants, loneliness was tied to conspiracy thinking, which in turn predicted support for norm-breaking political action and, in one experiment, actually refusing to pay 5 pence of VAT on a study payment.