Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
According to studies, men change their minds two to three times more often than women.
72
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
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