When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
Galalith is a type of plastic that can be made from milk. It is odourless, insoluble in water, biodegradable, anti-allergenic, antistatic, and virtually non-flammable.
1
Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65