Fine-grained volcanic ash can be found as an ingredient in some toothpastes.
55
People who laugh more are better able to tolerate pain - both physical and emotional.
36
Like fingerprints, everyone's tongue print is different.
250
There are 170,000,000,000,000,000,000,000,000 ways to play the ten opening moves in a game of chess.
266
A typical lead pencil can draw a line that is 35 miles long.
158
Dartboards are made out of horsehairs.
129
The sound you hear when you crack your knuckles is actually the sound of nitrogen gas bubbles bursting.
244
If you get water flowing fast enough, it can cut metal.
354