Pumice is the only rock that floats on water.
14
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Billions of neutrinos pass unnoticed through your body every second.
6
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
MIT has developed a camera that captures the speed of light at a trillion frames per second.
20
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
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