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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Colchicine is a highly poisonous alkaloid originally extracted from a type of saffron plant that is used mainly to treat gout.
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Malaria mortality rates are falling. Increased malaria prevention and control measures have greatly improved these rates. Since 2000, malaria mortality rates have fallen globally by 60% among all age groups, and by 65% among children under age 5.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.