- The lie detector was invented in 1921.
- The world's first roller coaster opened in 1884 at Coney Island New York.
- A cheetahs top speed is 114kph (70mph).
- There are over 1,600 known species of starfishes.
- Sir Isaac Newton was 23 when he discovered the law of gravity.
reload more facts | visit cool facts
add this widget to your website