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Author Question: When do gender differences in toy preferences and play activities begin to be noticeable in the K-12 ... (Read 23 times) |
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.
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In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.
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The horizontal fraction bar was introduced by the Arabs.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.