This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).
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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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As of mid-2016, 18.2 million people were receiving advanced retroviral therapy (ART) worldwide. This represents between 43–50% of the 34–39.8 million people living with HIV.
Plant Cell Types (Part 2)
Types of Neurons
Common Types of Neuropathic Pain
Types of wind deposits
Three Types of Muscular Tissue
In the retina, there are two types of light receptor cells: Rods are sensitive to differences in lig