Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
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
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Pure water (H2O) does not conduct electricity on its own.
46
A cesium atom in an atomic clock beats over nine billion times a second.
43