Standard paper cannot be folded in half more than 7 times.
232
Any domino can knock over another object up to 1.5x its size. The 32nd object would be big enough to knock over the Empire State Building.
18
Sudbury Valley School allows students to do whatever they want; no curriculum, tests, homework, or even classes unless requested. 82% of students get accepted to college, as opposed to the 63% national public school average.
21
The glue on Israeli stamps is certified kosher.
67
More than 50% of Americans fall asleep on their sides.
86
New York's Central Park is nearly twice the size of the entire country of Monaco.
42
Since 1982, a radio frequency emanating from Russia has been broadcasting a buzzer-like sound and, periodically, an unknown voice reads orders, names, and numbers. No one knows where exactly it is coming from or what it means.
13
Real diamonds do not show up on x-ray.
36