4.5 pounds of sunlight strike the Earth each day.
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Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
One cubic foot of gold weighs more than 1,200 pounds!
78
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13