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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).

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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.

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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.

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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.

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The strongest synthetic topical retinoid drug available, tazarotene, is used to treat sun-damaged skin, acne, and psoriasis.

Geoffroy's tamarin (Saguinus geoffroyi), also known as the Panamanian, red-crested or rufous-na Geoffroy's tamarin (Saguinus geoffroyi), also known as the Panamanian, red-crested or rufous-na
. Collagen (Mr 300,000) is a rod-shaped molecule, about 3,000 Å . Collagen (Mr 300,000) is a rod-shaped molecule, about 3,000 Å
A typical distributor-type diesel injection pump showing the pump, lines, and fuel filter. A typical distributor-type diesel injection pump showing the pump, lines, and fuel filter.
A beam-type torque wrench that displays the torque reading on the face of the dial. The beam display ... A beam-type torque wrench that displays the torque reading on the face of the dial. The beam display ...
A radiator may be either a down-flow or a cross-flow type. A radiator may be either a down-flow or a cross-flow type.
Type III curve. Mortality is highest early in life. Data for a desert shrub (Cleome droserifolia). Type III curve. Mortality is highest early in life. Data for a desert shrub (Cleome droserifolia).
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