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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.