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Author Question: A hunter aims a rifle at an angle of 10 below the horizontal. The hunter fires a bullet while ... (Read 151 times) |
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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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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Walt Disney helped combat malaria by making an animated film in 1943 called The Winged Scourge. This short film starred the seven dwarfs and taught children that mosquitos transmit malaria, which is a very bad disease. It advocated the killing of mosquitos to stop the disease.
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Vaccines prevent between 2.5 and 4 million deaths every year.