When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
17
Iron weighs more after it rusts.
68
The earth is approx. 6,588,000,000,000,000,000 tons.
175
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13
Indoor pollution is 10 times more toxic than outdoor pollution.
62
Pumice is the only rock that floats on water.
14