The Japanese, on average, are the shortest people.
320
In Japan, more adult diapers are sold than baby diapers.
50
In Japan, gambling is illegal. However, they circumvent the law by giving out prizes instead of cash, which the winner can then sell back to the establishment for cash.
-3
The 1 yen coin can be used as a weight, because it weighs exactly one gram. Also, it can float on water.
19