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Did you know?
The average adult has about 21 square feet of skin.
Did you know?
The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
Did you know?
Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.