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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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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By definition, when a medication is administered intravenously, its bioavailability is 100%.
Discipline-specific training can take years to perfect.