There are more nerve cells in one human brain than there are stars in the Milky Way.
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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.
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The FDA recognizes 118 routes of administration.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Cyanide works by making the human body unable to use oxygen.
Scientists (group photo)
Common eye and vision problems
Beta-lactam antibiotics: The beta-lactam ring is common to many different classes of antibiotics.
Negative feedback mechanism.
Some common eye disorders. (A) Conjunctivitis (“pinkeye”).