4.5 pounds of sunlight strike the Earth each day.
27
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Nearly 50% of the world's scientists are assigned to military projects.
71
Sound travels about 4 times faster in water than in air.
408
For every gallon of sea water, you get more than a quarter pound of salt.
45
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Pure water (H2O) does not conduct electricity on its own.
46
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55