The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
According to studies, men change their minds two to three times more often than women.
72
The earth is approx. 6,588,000,000,000,000,000 tons.
175
Sound travels fifteen times faster through steel than through air.
134
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
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Pumice is the only rock that floats on water.
14