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What Causes Hiccups? The hiccup reflex and several cures.
Why Do We Blink? The blinking reflex and its causes.
Why are Ears Shaped So Strangely? Those external folds of cartilage and skin, called the pinna, have important resonant properties that modify high-frequency sound waves entering the ear before funneling them to the middle ear.
What's the Temperature in Outer Space? Is space cold or hot? It depends on whether it's sunny or not.
Is the Bermuda Triangle Really Dangerous? There are logical explanations for the planes and ships lost in the Bermuda Triangle. Not that logic has anything to do with the legends.
How Did Earth Get Its Name? Nobody knows who named Earth, but we know a little bit about where the word originated.
How Long Does it Take to Make Petrified Wood? Over millions of years in an oxygen-deprived environment, minerals crystallize within the wood's cellular structure, forming the stone-like material known as petrified wood.
Why Do Men Have Nipples? Whatever your sex, everyone starts off as a woman in the womb. Nipples on men are a vestige of those early, gender-bending days.
Why Do They Call It Black Friday? The term Black Friday was first used to describe Sept. 24, 1869, when several financiers tried to corner the gold market.
Can Turkeys Fly? Wild turkeys feed on the ground, which may have something to do with the myth that they can't fly.
Who Invented the TV Dinner? Today, more than one-third of U.S. homes have a separate freezer in addition to the one that's part of the fridge, allowing for storage of plenty of TV dinners to gobble on demand. Who came up with the idea is not so clear.
Why Don't Penguin Feet Freeze on Ice? Actually, bare feet prevent these stately ice emperors from burning up in their suits.
Can Fright Turn Hair Suddenly White? For centuries, it has been widely believed that fright or dread can turn hair white. It's said Marie Antoinette's hair turned white the night before her execution.
What Causes a Charlie Horse? Expect cramps during states of exercise and dehydration.
What Causes Hunger Pangs? Hunger speaks not from the belly but from the brain.
Do People Really Die of Old Age? No one dies of old age. Usually when a person is said to have died "of old age," it means that he or she succumbed to one of the diseases common in our later years.
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.
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