Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
17
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Iron weighs more after it rusts.
68
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
Indoor pollution is 10 times more toxic than outdoor pollution.
62
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6