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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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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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There are more sensory neurons in the tongue than in any other part of the body.

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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

Hydrocephalus. The figure on the left is a child with the enlarged ventricles of hydrocephalus. The Hydrocephalus. The figure on the left is a child with the enlarged ventricles of hydrocephalus. The
(A) Figure illustrating the location and appearance of a peptic ulcer in both the stomach and the du (A) Figure illustrating the location and appearance of a peptic ulcer in both the stomach and the du
The paleoanthropologist must understand these deformations in order to figure out which strata a fos The paleoanthropologist must understand these deformations in order to figure out which strata a fos
A Production Function with Diminishing Marginal Product of Capital A Production Function with Diminishing Marginal Product of Capital
Refer to (d) in the figure above. This rectifier arrangement Refer to (d) in the figure above. This rectifier arrangement
Cost = $99.49; Rate of markup based on cost = 32%. Find the markup and selling price. Cost = $99.49; Rate of markup based on cost = 32%. Find the markup and selling price.
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