The chlorine smell in swimming pools is accentuated by the chemical's reaction with impurities (like poop.)
7
When glass breaks, the cracks move faster than 3,000 miles per hour. To photograph the event, a camera must shoot at a millionth of a second!
114
The sound you hear when you crack your knuckles is actually the sound of nitrogen gas bubbles bursting.
244
No matter its size or thickness, no piece of paper can be folded in half more than 8 times.
-64
160 cars can drive side by side on the Monumental Axis in Brazil, the world's widest road.
39
There are 293 ways to make change for a dollar.
148
The best recorded distance for projectile vomiting is 27 feet.
71
On average, 100 people choke to death on ballpoint pens every year.
72