0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
A cesium atom in an atomic clock beats over nine billion times a second.
43
A cubic yard of air weighs about 2 pounds at sea level.
31
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Sound travels fifteen times faster through steel than through air.
134
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
Each day, up to 150 species of life become extinct.
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