Nylon is made from coal and petroleum.
42
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Hot water can freeze faster than cold water.
181
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
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
Sound travels about 4 times faster in water than in air.
408