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Did you know?

The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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There are 20 feet of blood vessels in each square inch of human skin.

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People about to have surgery must tell their health care providers about all supplements they take.

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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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Everyone has one nostril that is larger than the other.

Large-scale impacts of the (a) positive, and (b) negative phases of the North Atlantic Oscillation. Large-scale impacts of the (a) positive, and (b) negative phases of the North Atlantic Oscillation.
Negative Feedback Insulin Glucagon Negative Feedback Insulin Glucagon
Positive and Negative Symptoms of Schizophrenia Positive and Negative Symptoms of Schizophrenia
Learning without Reinforcement (1 of 2) Learning without Reinforcement (1 of 2)
A negative feedback loop. A negative feedback loop.
The cell wall of a Gram-negative bacterium, E. coli The cell wall of a Gram-negative bacterium, E. coli
Video: Hormonal feedback loop components

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