Does the secret of Amelia Earhart’s disappearance lie in the underground haunts of the world’s largest land invertebrate? An aerial view of Nikumaroro Island in the Republic of Kiribati. One theory ...

There’s a reason we tend to feel sleepy around the same time each night — and why, if we don’t set an alarm, we tend to wake up at the same time in the mornings. As long as we’re not pulling ...

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. On Nov. 12, 2014, a European spacecraft named Philae landed on Comet 67P. To say it was a bumpy ...