In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
Scientists aren't sure what color dinosaurs were.
312
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
A cesium atom in an atomic clock beats over nine billion times a second.
43
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71