A B-25 bomber airplane crashed into the 79th floor of the Empire State Building on July 28, 1945.
28
Clocks made before 1660 had only one hand - an hour hand.
41
Leonardo da Vinci was dyslexic, and he often wrote backwards.
74
In 1982, a high school student from Los Angeles, California unscrambled the Rubik's Cube in 22.95 seconds.
59
Grenades were invented in China over 1,000 years ago.
49
The life expectancy in 1900 was just 47 years.
50
