Pumice is the only rock that floats on water.
14
One third of the electricity produced on earth is used to power electric light bulbs!
75
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
Scientists have revived a flowering plant from a fruit stored away in permafrost by Arctic ground squirrel 32,000 years ago.
16
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Your brain is 80% water.
525
German scientists claim to have evidence that suggests that our universe may exist inside of a computer simulated Matrix.
18
A single speck of dust is half way in size between a subatomic particle and the Earth.
15