We're all familiar with the idea of a sleep cycle. For people, sticking to a schedule helps our internal clock stay accurate, letting us sleep when it's time for bed, eat at mealtime and stay awake ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Giant pandas living ...

DEAR DOCTORS: Our 8-year-old son got sick with strep throat and had to miss a family camping trip. When my sister called to check on him, she asked me if I knew strep throat can cause ...

Giant pandas delight zoo-goers with their rolling, sliding, and joyful play—especially in the snow. But a new study reveals a potential challenge for the captive animals: When living in different ...