Heat waves mess with your brain. Scientists are trying to figure out why.

Research on firefighters shows that even 15 minutes of intense heat exposure makes it harder to focus and control attention. Scientists still don't know what days-long heat waves

This summer has been a scorcher for much of the Northern Hemisphere. June and July marked the hottest two-month stretch in Europe since record-keeping began. The contiguous US

This is today’s edition of The Download, our weekday newsletter that provides a daily dose of what’s going on in the world of technology. Heat waves mess with your

Europe is in the middle of a record-breaking heat wave, and the grid is being pushed to its limits as people turn to fans and air-conditioning to try to stay cool. Some power