When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Pure water (H2O) does not conduct electricity on its own.
46
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Brass doorknobs automatically disinfect themselves in about 8 hours.
18
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
One 75-watt bulb gives more light than three 25-watt bulbs.
57
Nearly 50% of the world's scientists are assigned to military projects.
71
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11