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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.

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

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Atropine was named after the Greek goddess Atropos, the oldest and ugliest of the three sisters known as the Fates, who controlled the destiny of men.

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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.

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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.

Divisions of the vertebral column. Divisions of the vertebral column.
Giardiasis. Colorized electron micrograph of a Giardia protozoan adhering to the surface of an epith Giardiasis. Colorized electron micrograph of a Giardia protozoan adhering to the surface of an epith
Single E. coli bacterium Single E. coli bacterium
In situ hybridization. This color-coded frontal section through a rat brain reveals high ... In situ hybridization. This color-coded frontal section through a rat brain reveals high ...
Transverse section and anterior surface of medulla oblongata Transverse section and anterior surface of medulla oblongata
A single cell from an early-stage human embryo A single cell from an early-stage human embryo
Video: Second Messengers in the Inositol-lipid Signaling Pathway

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