Cities account for 45 percent of the world's population, more than double the share in 1950.
A new study highlights five key eras of human brain development, and they don’t align with age quite as one might expect.
U.S. adults ages 65 and older lived alone in 2023, the most recent year with available data. That’s down from 29% in 1990.
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback