Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The earth is approx. 6,588,000,000,000,000,000 tons.
175
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
Indoor pollution is 10 times more toxic than outdoor pollution.
62