One barrel of petroleum holds 42 gallons.
20
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Iron weighs more after it rusts.
68
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Scientists aren't sure what color dinosaurs were.
312
Cold water weighs more than hot water.
93
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55