If the chemical sodium is dropped into water it will immediately and violently explode.
67
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
One gallon of used motor oil can ruin approximately one million gallons of fresh water!
71
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
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
One ragweed plant can release as many as one billion grains of pollen!
51
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199