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How Does Humidity Affect Evaporation? An explanation of relative humidity and its relation to evaporation.
Why is Quartz Used in Watches? Quartz crystals maintain a precise frequency standard, which helps to regulate the movement of a watch or clock, thus making the timepieces very accurate.
What is Winter Solstice? Winter solstice is the shortest day of the year in the Northern Hemisphere and marks the official beginning of winter. Find out why.
How Did America Get its Name? The naming of America goes to show that it pays to have a good publicist.
Do Pigs Sweat? Pigs do have a few sweat glands, but they're not very useful for temperature adjustment. So ...
What is a Stroke? A stroke can be any one of three significantly different problems with blood supply to the brain.
Does Cold Weather Cause Colds? The misconceptions and causes of the common cold.
How Much Does the Soul Weigh? In 1907, Duncan MacDougall devised experiments that he expected would actually measure the soul. His result: 21 grams. But...
Does a Water Molecule Have a Lifespan? Hydrogen atoms are constantly shuffling from one molecule to the next, pairing with a particular oxygen for only a millisecond. This might be described as one trio's lifespan, but ...
Can Oil Extraction Cause Earthquakes? Yes, but not the kind of quakes you hear about in the news.
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.
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