Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
The average temperature at 40,000 feet above sea level is -60 F.
56
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
In zero gravity, a candle's flame is round and blue.
16
One ragweed plant can release as many as one billion grains of pollen!
51
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
4.5 pounds of sunlight strike the Earth each day.
27