Iron weighs more after it rusts.
16
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
The bark of an older redwood tree is fireproof.
65
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
The force of a suction cup is calculated using F=AP.
15
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18