Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Pumice is the only rock that floats on water.
14
The average home creates more pollution than does the average car.
33
One cubic foot of gold weighs more than 1,200 pounds!
78
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Iron weighs more after it rusts.
16
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18