On average, the stomach produces 2 L of hydrochloric acid per day.
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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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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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.
Stars vary widely in size.
The proboscis monkey demonstrates that large gut size contributes to a lower EQ.
Sources of Energy in the United States
The three states of matter: solid, liquid, and gas.
Differential Heating of Land and Water
A land snail (Helix aspersa) with the opening that leads to its lung visible at the left.