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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?
Approximately 500,000 babies are born each year in the United States to teenage mothers.
Did you know?
Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.
Did you know?
Medication errors are three times higher among children and infants than with adults.
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.