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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 modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

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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.

Radial pattern of shoot growth in plants Radial pattern of shoot growth in plants
teach their children to care for the earth in hopes of passing on a better world to future generatio teach their children to care for the earth in hopes of passing on a better world to future generatio
Floor Pattern Floor Pattern
Both the top and bottom pattern have the same frequency. However, the amount of on-time varies. Both the top and bottom pattern have the same frequency. However, the amount of on-time varies.
Checklist for Choosing a Massage Table Checklist for Choosing a Massage Table
Abdominal reflex testing pattern Abdominal reflex testing pattern
Video: Properties of macromolecules (Explained with No Audio)

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