The last time American Green cards were actually green was 1964.
60
"Yo momma" jokes/insults were invented by Shakespeare.
39
A singing birthday card has more computing power than the allied forces in 1945.
30
The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
13
Each king in a deck of playing cards represents a great king from history: spades - King David, clubs - Alexander the Great, hearts - Charlemagne, and diamonds - Julius Caesar.
33
Cleopatra wasn't Egyptian; she was Greek.
107
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21