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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Did you know?
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
Did you know?
The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
Did you know?
The horizontal fraction bar was introduced by the Arabs.