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Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.

10 Famous Artworks by Leonardo da Vinci

Lead image for "A Timeline of the World in 8 Maps"

A Timeline of the World in 8 Maps

Hemp (Cannabis sativa).

9 Mind-Altering Plants

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

Bar graph of the United States Death Toll during major events. Infogram chart.

U.S. Death Toll During Major Events

Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

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

Who Was the Woman Behind the Statue of Liberty?

riser

staircase

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In staircase
… and the vertical front its riser; steps are placed between strings that are inclined to the angle of the staircase; strings are supported by newel posts that also support the handrail, forming a balustrade.
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