A cubic yard of air weighs about 2 pounds at sea level.
31
Scientists aren't sure what color dinosaurs were.
312
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
In zero gravity, a candle's flame is round and blue.
16
A cesium atom in an atomic clock beats over nine billion times a second.
43
Your brain is 80% water.
525
A ball of glass will bounce higher than a ball made of rubber.
73