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
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
Iron weighs more after it rusts.
16
The bark of an older redwood tree is fireproof.
65
Your brain is 80% water.
525
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
A cesium atom in an atomic clock beats over nine billion times a second.
43
There is a surgical implant being developed that will give you an orgasm at the touch of a button.
20