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
German chemists made a replica of a trophy the size of one molecule.
68
A ball of glass will bounce higher than a ball made of rubber.
73
The average temperature at 40,000 feet above sea level is -60 F.
56
In zero gravity, a candle's flame is round and blue.
16
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
Pure water (H2O) does not conduct electricity on its own.
46
Sound travels fifteen times faster through steel than through air.
134