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In ancient Rome, many of the richer people in the population had lead-induced gout. The reason for this is unclear. Lead poisoning has also been linked to madness.

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

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In 1885, the Lloyd Manufacturing Company of Albany, New York, promoted and sold "Cocaine Toothache Drops" at 15 cents per bottle! In 1914, the Harrison Narcotic Act brought the sale and distribution of this drug under federal control.

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Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

The major types of plant nutrients and their sources. The major types of plant nutrients and their sources.
Types of opioid receptors. Types of opioid receptors.
The most commonly used socket drive sizes include 1/4, 3/8, and 1/2 inch drives. The most commonly used socket drive sizes include 1/4, 3/8, and 1/2 inch drives.
Types of supercoiling found in chromosomes Types of supercoiling found in chromosomes
Various Types of Skull Fractures Various Types of Skull Fractures
Micrographs and drawings of three types of simple epithelia, with examples of their functions and lo Micrographs and drawings of three types of simple epithelia, with examples of their functions and lo
Video: Neural regulation of mechanical digestion- CNS voluntary, ANS & ENS controlled involuntary movements

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