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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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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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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.

German Shorthaired Pointer German Shorthaired Pointer
Controlled Experiments Manipulate a Variable Controlled Experiments Manipulate a Variable
Negative feedback control of a regulated variable. Negative feedback control of a regulated variable.
An overhead camshaft engine equipped with variable valve timing on both the intake and exhaust ... An overhead camshaft engine equipped with variable valve timing on both the intake and exhaust ...
Assume z is a standard normal random variable. What is the value of z if the area to the right ... Assume z is a standard normal random variable. What is the value of z if the area to the right ...
Variable and absorption costing, explaining operating-income differences. Variable and absorption costing, explaining operating-income differences.
Video: Ionic bonds - role of ions in the body

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