Until the nineteenth century, solid blocks of tea were used as money in Siberia.
80
Clocks made before 1660 had only one hand - an hour hand.
41
In 1987 American Airlines saved $40,000 by eliminating one olive from its First Class salads.
86
Leonardo da Vinci was dyslexic, and he often wrote backwards.
77
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
A monk had once written over a book that contained information about calculus that was written by Archimedes in ancient Greece that could have made us 100 or even 1000 years more mathematically and technologically advanced.
13
In 1700s, the deer skin was a common medium of exchange between the trading settlers and the native Red Indians in America. This is how a buck became a slang for a dollar.
28