Pumice is the only rock that floats on water.
14
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
During photosynthesis, plants emit light humans can’t see, but NASA can see that light from space - and they've even made maps of it!
21
Iron weighs more after it rusts.
68
Sound at the right vibration can bore holes through a solid object.
134