Out of all the senses, smell is most closely linked to memory.
146
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
German chemists made a replica of a trophy the size of one molecule.
68
A cesium atom in an atomic clock beats over nine billion times a second.
43
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
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7