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On average, the stomach produces 2 L of hydrochloric acid per day.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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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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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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Human neurons are so small that they require a microscope in order to be seen. However, some neurons can be up to 3 feet long, such as those that extend from the spinal cord to the toes.