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Did you know?
The horizontal fraction bar was introduced by the Arabs.
Did you know?
The longest a person has survived after a heart transplant is 24 years.
Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
Did you know?
Medication errors are three times higher among children and infants than with adults.
Did you know?
Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.