There's a difference between knowing that something evolved and understanding why it stuck around. Most of the systems running your body right now weren't designed for the life you're actually living.

Ever looked in the mirror and wondered what incredible, and sometimes unsettling, secrets your own body might be holding? Beyond the textbooks and common knowledge lies a fascinating realm of bizarre ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." Stay sharp and learn something new every day or stock up on knowledge for the next 105 days with these ...

Explore 15 strange facts about the human body that sound surreal. From glowing skin to acid-proof stomachs, our biology is stranger than fiction.