Pumice is the only rock that floats on water.
14
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Each day, up to 150 species of life become extinct.
-23
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
The idea of left brain (logical) and right brain (creative) has no basis in neuroscience and is in fact a myth.
16
One barrel of petroleum holds 42 gallons.
20