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In 1864, the first barbiturate (barbituric acid) was synthesized.
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There are 20 feet of blood vessels in each square inch of human skin.
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More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Allergies play a major part in the health of children. The most prevalent childhood allergies are milk, egg, soy, wheat, peanuts, tree nuts, and seafood.
![Classification of life histories based on juvenile survival, fecundity, and age at reproductive matu](https://biology-forums.com/gallery/47/medium_33_22_09_11_9_27_14_1790554.jpeg)
![John Lewis Krimmel’s painting of the Fourth of July in Centre Square Philadelphia (1812) shows the d](https://biology-forums.com/gallery/47/medium_374628_16_08_15_9_59_55_222732435.jpeg)