Indoor pollution is 10 times more toxic than outdoor pollution.
62
One 75-watt bulb gives more light than three 25-watt bulbs.
57
A cesium atom in an atomic clock beats over nine billion times a second.
43
Iron weighs more after it rusts.
16
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
Each day, up to 150 species of life become extinct.
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