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Do People Really Die of Old Age? No one dies of old age.
Why is Yawning Contagious? Some current theories focus on yawning as a social cue (like laughing) that communicates information and helps organize group behavior.
What's the Significance of 11/11? Some people feel haunted by the number everywhere they go, claiming it's a nod from angels or a mystical sign of eleven's importance in math and science.
Do Tornados Strike Outside the United States? Tornadoes are a worldwide phenomenon, touching down in every continent save Antarctica.
What is Amnesia? Amnesia can occur as a result of head trauma, drug toxicity, stroke, Alzheimer disease, infection or even emotional shock.
How Does a One-way Mirror Work? The mirror used in your favorite detective scene has a thin layer of partially reflective coating.
Do I Really Have to Wait an Hour After Eating Before Swimming? Moms impart many nuggets of homespun wisdom. This is probably not one of them.
Why Do We Blush? Blushing is a uniquely human response to unwanted social attention.
Why Do We Have an Adam's Apple? Contrary to popular belief, both males and females have Adam's Apples, a chunk of bony cartilage that's wrapped around the larynx.
Why is Fecal Matter Brown? The end product of the digestive process and the secret of its chief visual property.
Why is Hair Parted? The function of body and head hair, and why it grows the way it does.
Why Do We Carve Pumpkins at Halloween?
Are Left-Handed People Smarter? Psychologists are far from a consensus on how to measure vague concepts like creativity and intelligence.
How Does a Microwave Oven Work? The frozen burrito in your microwave oven sits in an electromagnetic field, bombarded on all sides by high-frequency microwaves.
How Do Cats Purr? Scientists are still puzzled over the exact mechanism of purring.
Why Do My Eyes Close When I Sneeze? Ah, the illusive achoo -- there's much mystery surrounding our sternutation reflex, a.k.a. the sneeze.
What Causes a Fever? The brain responds to sickness by knocking the thermostat up a few notches to stimulate production of disease-fighting antibodies.
Why Do Golf Balls Have Dimples? Nearly a century ago, after someone realized that a scuffed-up ball travels farther than a shiny new one, balls gained dimples.
Why Do We Cry? Believed unique to humans, emotional tears carry certain hormones and other proteins, produced during periods of stress, out of the body, which may explain the cathartic effect of a good cry.
Where Do Electrons Get Energy to Spin Around an Atom's Nucleus? Electrons were once thought to orbit a nucleus much as planets orbit the sun. That picture has since been obliterated by modern quantum mechanics.
Why Does My Arm Fall Asleep? An explanation of limb numbness and paresthesia.
How Did the Hawaiian Islands Form? Scientists don't know all the details, but the process begins millions of years ago deep below the Pacific Ocean where the current islands are anchored to one of the rocky slabs that make up Earth's outer crust.
Why is Friday the 13th Considered Unlucky? Folklorists think the dread goes back at least a few centuries, and may well trace its roots all the way to Biblical times, when the 13th guest at the Last Supper betrayed Jesus and caused his Crucifixion, which was held on a Friday.
Why Do Icebergs Float? There are several reasons. The first is due to one of water's many amazing properties.
Why Do We Shiver When Cold? If the surface of your skin gets too chilly, the brain sets into motion a series of warming tricks such as shivering.
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