From using words to overthrowing regimes, shared awareness is necessary for people to coordinate. The cognitive scientist explains to Nature how it works. When Everyone Knows That Everyone Knows...: ...

At some point in the past decade or two, dance-music d.j.s discovered a way of punctuating their sets with a prank. Just as the music was reaching a crescendo, it would glitch, then cut out completely ...

If you’re unsure whether you’ve entered perimenopause, try tracking your periods or speaking with a menopause specialist. You can also check for lesser-known symptoms, such as tingling limbs or brain ...

You don’t buy me, borrow me, or steal me, I’m handed over freely at first. Break me once, and I change forever, and I am challenging to repair. Keep me well, and I multiply. What am I? Trust. Some ...

Two reports on U.S. loneliness came out in 2025. One said about 41 percent of adults were lonely. The other said about 61 percent. Same country, same year—a 20-percentage-point gap. These weren't ...