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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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The horizontal fraction bar was introduced by the Arabs.

Hydrocephalus. The figure on the left is a child with the enlarged ventricles of hydrocephalus. The Hydrocephalus. The figure on the left is a child with the enlarged ventricles of hydrocephalus. The
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Video: Calvin Cycle Explained!

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