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Author Question: Ralph has just taken two achievement tests. He scored at the 90th percentile on the Ohio Reading ... (Read 69 times) |
Did you know?
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.