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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

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Immunoglobulin injections may give short-term protection against, or reduce severity of certain diseases. They help people who have an inherited problem making their own antibodies, or those who are having certain types of cancer treatments.

The visual field as seen by a person with (a) glaucoma, (b) macular degeneration, and (c) cataracts. The visual field as seen by a person with (a) glaucoma, (b) macular degeneration, and (c) cataracts.
Edward Bellamy, author of the utopian novel Looking Backward (1888) Bellamy’s socialism worried many Edward Bellamy, author of the utopian novel Looking Backward (1888) Bellamy’s socialism worried many
Instruct recipient on giving you feedback immediately if heat becomes too intense. Remind the person ... Instruct recipient on giving you feedback immediately if heat becomes too intense. Remind the person ...
Food security per person Food security per person
The flow of energy and the cycling of materials maintain nature’s organization The flow of energy and the cycling of materials maintain nature’s organization
(left) Urine sample from an unaffected person does not change color upon exposure to air. (right) Ur (left) Urine sample from an unaffected person does not change color upon exposure to air. (right) Ur
Video: Cardiac Cycle (Part 1 of 4)

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