The largest yet study on a four-day workweek included 141 companies, 90 percent of which retained the arrangement at the end ...

To celebrate Scientific American ’s 180th anniversary, we’re publishing jigsaw puzzles to show off some of our most fascinating magazine covers over the years. Take a tour here through the covers so ...

This is the shape of the classic soccer ball, originally called the Telstar ball and used in the official FIFA World Cup ...

For people under the sweltering influence of a heat dome, the weather pattern can be excruciatingly tedious to endure, ...

As large language models like Claude 4 express uncertainty about whether they are conscious, researchers race to decode their ...

Heat and humidity will once again smother the eastern half of the country this week, pushing the heat index to dangerous ...

Astronomers think small space rocks from beyond our solar system routinely strike Earth—but proving it isn’t easy ...

A hormone-free pill, called YCT-529, that temporarily stops sperm production by blocking a vitamin A metabolite has just ...

A controversial arsenic microbe study unveiled 15 years ago has been retracted. The study’s authors are crying foul ...

Physicists superheated gold to 14 times its melting point, disproving a long-standing prediction about the temperature limits ...

Optimists have similar patterns of brain activation when they think about the future—but pessimists are all different from ...

S4, a $900-million cosmology experiment, would answer one of the greatest questions in physics. Instead it’s become another ...