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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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There are 20 feet of blood vessels in each square inch of human skin.
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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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In the ancient and medieval periods, dysentery killed about ? of all babies before they reach 12 months of age. The disease was transferred through contaminated drinking water, because there was no way to adequately dispose of sewage, which contaminated the water.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.