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Did you know?
Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
Did you know?
Less than one of every three adults with high LDL cholesterol has the condition under control. Only 48.1% with the condition are being treated for it.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.