What you do on your screens matters as much as how much time you spend on them.

Learn how measuring and monitoring astronauts’ cognitive abilities could improve performance, safety on longer missions.

Learn why the remains discovered at a chamber called the Treasury confirm that Petra had an ancient tomb.

Learn how early humans employed specialized fire pits to create resins needed to attach stone tool parts to wooden shafts.

Mold growths are common in homes, and unless the damage is widespread, they usually aren’t harmful.