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
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Balsa wood is classified as a hard wood!
41