In zero gravity, a candle's flame is round and blue.
16
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
The Manchineel Tree is so poisonous, rainwater dripping off it’s leaves will burn your skin.
17
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
Most dust particles in your house come from dead skin.
48
The average home creates more pollution than does the average car.
33
A cesium atom in an atomic clock beats over nine billion times a second.
43