Sound travels about 4 times faster in water than in air.
408
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
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
Nearly 50% of the world's scientists are assigned to military projects.
71
Sound travels fifteen times faster through steel than through air.
134
Nylon is made from coal and petroleum.
42
Each day, up to 150 species of life become extinct.
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