hippus

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The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

NBA Lakers Celtics Finals Kevin Garnett shooting.

10 Great Sports Rivalries

Space race (1957-1969) infographic between United States (U.S.) and Russia. America, Soviet Union, U.S.S.R., space exploration

Timeline of the Space Race, 1957–69

Hemp (Cannabis sativa).

9 Mind-Altering Plants

Statue of Liberty in front of the skyline of Manhattan, New York City, New York.

Who Was the Woman Behind the Statue of Liberty?

Groups of depositors in front of the closed American Union Bank, New York City. April 26, 1932. Great Depression run on bank crowd

Causes of the Great Depression

Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

hippus

physiology

Learn about this topic in these articles:

visual apparatus

In human eye: The pupil
…that, if exaggerated, is called hippus.
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