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Why Does Jell-O Jiggle? As the concoction slowly cools in the fridge, some bonds don't reconnect. These gaps are filled with water and give the dessert its wiggle.
How Many Senses Do Humans Have? Humans possess a host of senses less obvious than the five you know.
Why are Manhole Covers Round? Round covers are also easier to manufacture, and they can't slip into the hole.
What Causes Deja Vu? Some believe deja vu involves emotional responses to similar events; others figure the brain short circuits, sending an event to memory just a split second before putting it into consciousness.
Do Identical Twins Have Identical Fingerprints? Sporting the same DNA, and thus matching physical features, identical twins can get away with duping friends and family.
Do People Really Use Just 10 Percent of Their Brains? Brain imaging scans clearly show that the vast majority of the brain is used.
Why Does the Moon Look Bigger on the Horizon? You might have heard it is magnified by the atmosphere just as it rises. Not so. Instead, it's your brain on Moon drugs.
What Causes Eye Flashes and Floaters? The most common cause of eye flashes is pulling between parts of the eye and the most common cause of floaters when this pulling causes material to break free.
Where Did Chalkboards Come From? Chalkboards, sometimes just pieces of wood painted with black, liquid slate, hit the wall in the early 19th century.
Why is it Called Labor Day? The first Labor Day took place in New York City on Sept. 5, 1882, with picnics organized by the city's Central Labor Union.
Why is the Great Pyramid So Sloppy? Khufu’s Great Pyramid at Giza has long been pillaged by locals for its valuable stone.
Does the Universe Have an Edge? The universe has no edge. And even if it did, you could never go there because it is expanding so fast that the farthest parts are unreachable.
Why Do We 'God Bless'ť a Sneeze? Folklorists believe people began blessing sneezes sometime in the Middle Ages as a way of protecting the soul.
Does Lightning Hit Airplanes? A handful of jets have been blown up by lightning. But modern designs deal with the strikes.
Where Did the Purple Heart Come From? Back on an August day in 1782, General George Washington ordered a Badge of Military Merit created.
What Do Antibiotics Do? When you get sick, more often than not the miscreant is a microbe, and doctors often fight back with antibiotics.
Will Pluto Ever Hit Neptune? Since Pluto's orbit intersects Neptune's orbit, will Pluto ever crash into Neptune or become one of Neptune's moons?
Why are they Called Private Eyes? In 1850, the sheriff of Cook County Illinois opened up the nation's first private detective agency.
How is Coffee Decaffeinated? For those who like the taste of java but can't stand the jitters, scientists have devised a variety of ways to extract caffeine from coffee beans.
Why is August So Batty? Every August, the Bat Phone starts ringing at the Humane Society. Callers are surprised by bats in the house.
Why Do State Fairs Exist? State fairs are great places to throw ping-pong balls at goldfish or see a rodeo or buy cheap peaches or maybe marvel at the latest corn harvesters.
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