Clocks made before 1660 had only one hand - an hour hand.
41
There are 92 known cases of nuclear bombs lost at sea.
148
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
The great wall of China is 1,400 miles long!
44
The site where the Parthenon was built had to be cleared of hundreds of dinosaur bones (then called giants' bones) before construction could begin.
13
Early Romans used to use porcupine quills as toothpicks.
27
