Until the nineteenth century, solid blocks of tea were used as money in Siberia.
80
The exact cause of death and burial site of Genghis Khan is unknown, because all of the 2000 funeral guests and 800 soldiers were killed in order to preserve the secret.
16
Jericho is the oldest walled city in the world at 9,000 yrs old!
55
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
When Charles Darwin first discovered the Galapagos Tortoises, he tried to ride them!
18
The oldest glowing lightbulb was first switched on in 1901 and lives in fire stations in Livermore, CA. It is known as the Centennial Light.
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