Blue eyes are the most sensitive to light, dark brown the least sensitive.
105
Passengers on the Beijing subway can pay with plastic bottles.
29
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
The revenue that is generated from gambling is more than the revenue that comes from movies, cruise ships, recorded music, theme parks, and spectator sports combined.
15
The chlorine smell in swimming pools is accentuated by the chemical's reaction with impurities (like poop.)
7
Each year, more than 50,000 people are injured by jewelry in the U.S.
29
Mentally doing a task makes you better at it. Your mind can barely tell the difference.
18
A Swiss man replaced his car's broken heater with a fully functional wood burning stove.
15