Iron weighs more after it rusts.
68
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
All Humans Are 99.9% Genetically Identical and 98.4% of human genes are the same as the genes of a chimpanzee.
51
A cesium atom in an atomic clock beats over nine billion times a second.
43
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
Hot water can freeze faster than cold water.
181