There are actually seven different types of twins: Identical, Fraternal, Mirror-Image, Polar Body (Half Identical), Mixed Chromosome, Superfecundation, and Superfetation.
20
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Forty percent of Americans have never visited a dentist.
33
Intelligent people have more zinc and copper in their hair.
233
A hard working adult sweats up to 4 gallons per day.
39
On average a woman has 4 sexual partners in her lifetime.
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