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There are 60,000 miles of blood vessels in every adult human.

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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.

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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.

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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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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.

Protoneuridae is a family of damselflies. Most species are commonly known as threadtails, while othe Protoneuridae is a family of damselflies. Most species are commonly known as threadtails, while othe
Lateral View of the human brain in cross section Lateral View of the human brain in cross section
Before the advent of vaccinations and antibiotics, infectious diseases such as cholera were the scou Before the advent of vaccinations and antibiotics, infectious diseases such as cholera were the scou
Australia's spiny anteater, one of only three modern species of monotremes Australia's spiny anteater, one of only three modern species of monotremes
Life cycle of a Plasmodium species that causes malaria Life cycle of a Plasmodium species that causes malaria
Video: Introduction to Insulin

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