Birds exhibit unihemispheric sleep, a fascinating compromise between rest and survival. One half of their brain remains alert while the other rests, allowing them to scan for threats with an open eye.

The animal kingdom is full of fascinating adaptations, and one of the most intriguing is the ability to sleep with one eye open. While humans drift into deep slumber with both eyes closed, several ...

This story was originally published by CalMatters. Sign up for their newsletters. If you’re serving hard time inside a California prison, you’ll often find yourself stuck in a cramped cell with a ...

If you're serving hard time inside a California prison, you'll often find yourself stuck in a cramped cell with a complete stranger. You hang a bedsheet to manufacture the semblance of privacy between ...