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In 1864, the first barbiturate (barbituric acid) was synthesized.

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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.

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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

Connell's experimental manipulation of species indicated the presence of competition. Connell's experimental manipulation of species indicated the presence of competition.
Tree species richness in North America is correlated with evapotranspiration rate. Tree species richness in North America is correlated with evapotranspiration rate.
Two species of diatoms showing clearly distinct morphologies. Two species of diatoms showing clearly distinct morphologies.
muscles human muscles human
Human impacts and the built environment Human impacts and the built environment
Human population growth, 1700 - present Human population growth, 1700 - present
Video: Polymerase chain reaction PCR - Animation

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