The 1 yen coin can be used as a weight, because it weighs exactly one gram. Also, it can float on water.
19
The first foreigner to become a samurai was an African slave.
26
In Japan, more adult diapers are sold than baby diapers.
50
Japan's capital Tokyo means "Eastern Capital".
1
In Japan, it is tradition for husbands to get a monthly allowance from their wives.
6