At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
If the chemical sodium is dropped into water it will immediately and violently explode.
67
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Pumice is the only rock that floats on water.
14
German chemists made a replica of a trophy the size of one molecule.
68
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
Sound at the right vibration can bore holes through a solid object.
134