The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
A cubic yard of air weighs about 2 pounds at sea level.
31
Rafflesia Arnoldii is the largest flower in the world and can grow as big as an umbrella.
42
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
A cesium atom in an atomic clock beats over nine billion times a second.
43
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
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
Most dust particles in your house come from dead skin.
48