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Did you know?

Although the Roman numeral for the number 4 has always been taught to have been "IV," according to historians, the ancient Romans probably used "IIII" most of the time. This is partially backed up by the fact that early grandfather clocks displayed IIII for the number 4 instead of IV. Early clockmakers apparently thought that the IIII balanced out the VIII (used for the number 8) on the clock face and that it just looked better.

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Your heart beats over 36 million times a year.

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The types of cancer that alpha interferons are used to treat include hairy cell leukemia, melanoma, follicular non-Hodgkin's lymphoma, and AIDS-related Kaposi's sarcoma.

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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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Excessive alcohol use costs the country approximately $235 billion every year.

Orientation versus navigation. Orientation versus navigation.
(b) The landscape around the deserts of Osoyoos, British Columbia. (b) The landscape around the deserts of Osoyoos, British Columbia.
Forest fragments left by clear-cutting forest from the surrounding landscape have very different phy Forest fragments left by clear-cutting forest from the surrounding landscape have very different phy
Annibale Carracci, Landscape with Flight into Egypt. Annibale Carracci, Landscape with Flight into Egypt.
Landscape ecologists study broad geographical patterns Landscape ecologists study broad geographical patterns
An artist’s depiction illustrating the orientation of the base An artist’s depiction illustrating the orientation of the base
Video: Cardiac Cycle (Part 4 of 4)

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