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Need to pack a lunch that doesn't require a refrigerator? Find out what's safe to pack in an unrefrigerated lunch at HowStuffWorks.

Are there dangers lurking in your lip color? Find out if lead in lipstick can cause cancer at HowStuffWorks.

Vagina teeth are the stuff of legends — but is it possible for a woman to have teeth in her vagina? The answer might surprise you.

Is your foot really the same length as your arm from wrist to elbow? Find out with a little help from Da Vinci at HowStuffWorks.

Nutrition labels list daily values based on a 2,000-calorie diet. But where did the 2,000-calorie diet come from? Find out.

Research has proven lullabies can lower stress levels in babies. Learn why lullabies work at HowStuffWorks.

It's likely that humans will evolve to need more sleep. Find out if we will learn to live without sleep at HowStuffWorks.

Sleep deprivation can have many side effects, but is death one of them? Find out if you can die if you never sleep at HowStuffWorks.

Antidepressants are often used to treat things that aren't depression. Find out about off-label antidepressant use at HowStuffWorks.

Humans have regrown fingertips, but can we regrow whole limbs? Find out at HowStuffWorks.