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What Makes Ice Cubes Cloudy? Water free of minerals and impurities freezes first, pushing the cloudy parts containing the sediment (and tiny trapped air bubbles) toward the center.
Why Do Air Traffic Control Towers Have Slanted Windows? Many people assume that they are designed that way to prevent the sun's reflection or glare from blinding incoming pilots. But this explanation doesn't fly.
Why Does Popcorn Pop? Within minutes, a teardrop-shaped kernel no larger than a pea can magically mushroom into a fluffy treat that's at least 35 times its original volume.
Who Invented Chess? Chess has its roots in India and Persia.
Why Does Mona Lisa’s Smile Change? Among the top questions baffling art enthusiasts is the elusive grin. Did da Vinci intentionally create the ambiguous appearance?
Is Flying Safer Than Driving? For flying to become as risky as driving in the United States, a packed commercial jet would have to go down once a month.
What is Perfect Pitch? Those rare musicians who have perfect pitch can name any note just by hearing it.
What Battle Inspired the Star Spangled Banner? The rockets were glaring red and the bombs were bursting in air as the British relentlessly attacked.
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' 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?
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