The Human Brain

What are dreams really made of? Are humans the smartest animal? What causes schizophrenia? Travel inside the mind and find out how the human brain works.

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Alcoholism can be difficult to spot. Learn the difference between heavy drinking and alcoholism, how alcohol affects the body, what factors may lead to alcoholism and what treatments are available for this addiction.

By Stephanie Watson

Should we bother to interpret our dreams? Are these nighttime stories random brain impulses, or do they offer insight into our waking lives? Learn what's happening in your brain while you dream.

By Lee Ann Obringer

Whether brain death is a result of cardiac arrest and lack of oxygen to the brain, or of a gunshot wound to the head, the diagnosis is the same. Learn what the term "brain dead" actually means.

By Leslie C. Olson

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Every animal you can think of -- mammals, birds, reptiles, fish, amphibians -- all have brains. But the human brain is unique. It gives us the power to think, plan, speak and imagine.

By Craig Freudenrich, Ph.D. & Robynne Boyd

Your co-worker just yawned in a meeting, and now everyone on his side of the table is yawning, too. Learn about what might've caused him to do it in the first place and why you're likely to yawn right along with them.

By Melanie Radzicki McManus

Even if you're very ticklish, you probably are incapable of tickling yourself. Learn why.

The term IQ typically refers to a score on a test that measures someone's cognitive ability. What does this test constitute exactly? Find out if IQ tests can accurately measure someone's intelligence.

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We've all heard of a "sixth sense" and extra-sensory perception. So how many ways can we actually sense the world around us?

By HowStuffWorks.com Contributors

Every animal sleeps -- some more than others -- but why they do it is a mystery to scientists. Is sleep more than just beauty rest? Could skimping on it kill you? And how much do you really need?

By Marshall Brain