Featured Article: Why do you have two lungs but only one heart?
Why don't you have two hearts? Here's a hint: It's the same reason why you have one liver, but two eyes. Would a second heart help you live better? See more »
body parts library
Body Parts work together to perform different functions required for life. Learn how your internal organs operate in this section.
Articles 1-19 of 19
Are left-handers quicker thinkers than righties?
Scientific studies are showing that lefties are quicker and more adroit in some activities than their right-handed counterparts. How much validity does this assertion hold?
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Are lefties better at sports?
The trials of being a lefty are numerous. You jostle for elbow room at the table, use scissors that feel funny in the hand and are teased for writing oddly. But do beleaguered lefties get the last laugh in sports?
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Are people without wisdom teeth more highly evolved?
If wisdom teeth are so wise, why do they keep sprouting in the gums of people who don't need them anymore? Should a lack of wisdom teeth give you bragging rights as a highly evolved human?
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Body Works: Human Body Quiz
You remember a little ditty about the thigh bone being connected to the hip bone, which was in turn connected to the backbone. But what else do you remember about human anatomy? The answers to this quiz are all inside of you -- literally.
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How Amputation Works
Amputations have been performed since ancient times, but did you know anesthesia wasn't developed until the 1840s? Mountaineer Aron Ralston amputated his own arm after being trapped by a boulder. Could you do it?
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How can someone be born with organs outside the body?
It happens more often than you may think. Sometimes a baby is born with organs outside of his or her body and has a slim chance of survival. What causes this?
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How Organ Donation Works
It's as easy as checking yes" when you register for or renew your driver's license. But organ donation is actually a complex and serious process.
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How Organ Transplants Work
Today, organ transplants are relatively simple procedures, yet thousands of people die every year waiting for their turn. Find out about transplants and what’s being done to remedy the organ-shortage problem.
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How Vestigial Organs Work
Vestigial organs are like the contents of your junk drawer: an assortment of objects that once had a purpose or might come in handy. What can these evolutionary mementos tell us?
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How Your Appendix Works
Does the appendix serve any purpose in the human body? Scientists are divided on the issue -- learn why.
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How Your Kidneys Work
The kidneys spend 24 hours a day, seven days a week filtering gallons and gallons of blood. But that's not all these little bean-shaped organs accomplish in a day.
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What makes your arms, legs and feet fall asleep?
Having a limb fall asleep can range from annoying to downright painful. See what's going on inside your arm or leg when it falls asleep.
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Where's the best place to take a bullet if you get shot?
Getting shot is not something we want to happen, but if it does, where is the best place to take a bullet? Find out what the experts think.
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Why are some people born with a reversal of organs?
Most people's organs follow the same basic layout -- heart on the left, appendix on the right and stomach in the middle. But in about 1 in 10,000 births, organs end up on the opposite side.
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Why do you have two lungs but only one heart?
Why don't you have two hearts? Here's a hint: It's the same reason why you have one liver, but two eyes. Would a second heart help you live better?
See more »
13 People with Extra Body Parts
Extra body parts can occur more often than people might think. Doctors call the extra appendages "supernumerary" body parts and these can be found on some famous people in history.
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16 Unusual Facts About the Human Body
Our list of 16 unusual facts about the human body will both shock and enlighten. Did you know that everyone has a unique tongue print or that we shed skin cells the same way a dog sheds hair?
See more »Exactly why is your thyroid so important?
Chances are rather good you've heard the news that you have a thyroid -- but chances are also pretty decent you're not completely up to speed on exactly why you have one. What can your thyroid do for you?
See more »What is an appendix and what causes appendicitis?
Your appendix is really a pretty mysterious organ. Find out why you have an organ that's not necessary to your survival.
See more »Articles 1-19 of 19
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