The horizontal fraction bar was introduced by the Arabs.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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Amoebae are the simplest type of protozoans, and are characterized by a feeding and dividing trophozoite stage that moves by temporary extensions called pseudopodia or false feet.
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Everyone has one nostril that is larger than the other.
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Cyanide works by making the human body unable to use oxygen.
Here's how comic book heroes are made
The fossil record of chimpanzees is sparse. The femur from Kikongo, Uganda (c) may represent a late
Return of oxygenated blood to the heart and entry into the aorta (red = oxygenated blood, blue = ...