The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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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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There are 20 feet of blood vessels in each square inch of human skin.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
The hierarchy of forces governing protein structure.
When horses lie down to sleep, others in the herd remain standing, awake or in a light doze, keeping
Maslow’s hierarchy of needs.
Nursing Interventions for Different Levels of Anxiety
Using small, circular strokes, exfoliate the client’s neck and back.