In zero gravity, a candle's flame is round and blue.
16
One cubic foot of gold weighs more than 1,200 pounds!
78
Your brain is 80% water.
525
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
A cubic yard of air weighs about 2 pounds at sea level.
31
Pure water (H2O) does not conduct electricity on its own.
46
Nearly 50% of the world's scientists are assigned to military projects.
71