Most dust particles in your house come from dead skin.
48
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
German chemists made a replica of a trophy the size of one molecule.
68
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
Balsa wood is classified as a hard wood!
41
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
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
The average home creates more pollution than does the average car.
33