Indoor pollution is 10 times more toxic than outdoor pollution.
62
One 75-watt bulb gives more light than three 25-watt bulbs.
57
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
Scientists aren't sure what color dinosaurs were.
312
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Research indicates that plants grow healthier when they are stroked.
173
One ragweed plant can release as many as one billion grains of pollen!
51
In zero gravity, a candle's flame is round and blue.
16