Body Parts

Body Parts work together to perform different functions required for life. Learn how your internal organs operate in this section.

No. 5 may seem like it's just hanging out there, but if you've ever injured it, you may have discovered how important it is for walking.

The Jamaican sprinter has a uniquely uneven gait. Is he the fastest man alive because of, or despite, this asymmetry?

This organ is finally getting some street cred after centuries of being largely underestimated.

Guess who's the new kid on the block?

When a teen lifts a burning car off the ground, it seems like a superhuman feat. But there's some simple — and amazing — science behind it.

The human tongue is essential for speaking and eating ice cream. Ever worry about swallowing yours? We can put that concern to bed.

There's nothing worse than biting your tongue. Unless it swells up and gets infected — thankfully it's pretty rare. See why.

One of the world's most enduring questions – besides "why do men have nipples?" – is "why don't women have Adam's apples?" The answer isn't as simple as you might think.

Were you ever subjected to "tickle torture" from an older sibling? If you're feeling uncomfortable right now, you might be more sensitive to the dreaded tickle monster than the rest of us.

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

You can test this pretty easily for yourself, but does it hold true for most people? Da Vinci has the answer.

So many notes announcing new babies start, "Everyone's safe and healthy with 10 fingers and 10 toes." But why do most folks have 10 of each?

As anyone who's ever used a cotton swab knows, human ears generate a fair amount of earwax. But what exactly is the stuff, and do you need to make a point of clearing it out every so often?

If you have chronically itchy elbows, you're probably irritated in more than one way, as elbows aren't easy to scratch. For what it's worth, you're also in good company: A certain Civil War general shared your itchy condition.

Certain scientists have taken on the unappealing job of evaluating the debris that hangs out in the human belly button. What's hiding in your belly button?

Do your ears hang low? Do they wiggle to and fro? Could it be because your ears keep right on growing long after the rest of you has stopped?

The human body is full of things that might make you shudder -- sweat, eye gunk, pus, partially digested food. What are some of the ickiest and most nausea-inducing items you're carting around in your person?

If you've ever considered burning them off for various nefarious purposes, you may want to reconsider. Those babies are more than just loopy tools of identification.

During early pregnancy, both male and female human embryos develop something called milk lines, ridges that eventually recede into nipples. Why have some species lost this unisex trait, and can human men actually produce milk?

Every day in the United States, an average of 18 people die while awaiting organ transplants because of a critical shortage of donors. Get facts about organ donation here.

Every guy is self-conscious about something, and hours are often spent wondering how he measures up to the competition. But what would-be body flaws are the most embarrassing?

Beauty may be in the eye of the beholder, but women are definitely held to higher standards than men. Could this be why so many of us are embarrassed of our bodies?

No one is perfect, but sometimes, we go above and beyond to hide our flaws. Is your No. 1 insecurity on our list?

Your pituitary gland manages most hormone production. Learn about the pituitary gland in this article.

The sphenoid sinuses are located behind your eyes. Learn more about what sinus is located behind your eyes from this article.