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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.

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Common abbreviations that cause medication errors include U (unit), mg (milligram), QD (every day), SC (subcutaneous), TIW (three times per week), D/C (discharge or discontinue), HS (at bedtime or "hours of sleep"), cc (cubic centimeters), and AU (each ear).

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.

Graphic display of hypothetical results of a predator removal experiment. Graphic display of hypothetical results of a predator removal experiment.
The Meselson-Stahl Experiment p2 The Meselson-Stahl Experiment p2
Why are some of the letters above the red line and some letters below? Why are some of the letters above the red line and some letters below?
The Milgram Obedience Experiment The Milgram Obedience Experiment
Finding the equation of a line Finding the equation of a line
Ramey's study, children from poverty-level families IQ experiment Ramey's study, children from poverty-level families IQ experiment
Video: Osmosis - Isotonic, Hypotonic, and Hypertonic​ Solutions

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