Pumice is the only rock that floats on water.
14
The average temperature at 40,000 feet above sea level is -60 F.
56
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
One barrel of petroleum holds 42 gallons.
20
Cold water weighs more than hot water.
93
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
17