Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
For every gallon of sea water, you get more than a quarter pound of salt.
45
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Iron weighs more after it rusts.
68
Sound travels fifteen times faster through steel than through air.
134
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
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