The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.
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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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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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Computer programs are available that crosscheck a new drug's possible trade name with all other trade names currently available. These programs detect dangerous similarities between names and alert the manufacturer of the drug.
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An EEG Recording of the Stages of Sleep
Sleep in a Dolphin
Sleep Hygiene Guidelines
Share of Hours Worked by Education Level, 1940–2008
