gear

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Study how a series of gears in a waterwheel translates a stream's energy to a millstone

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Close up of periodic table, focus on nickel, copper, zinc, palladium, silver, cadmium

When Was the Periodic Table Invented?

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

New Seven Wonders of the World

Solar eclipse of the sun.

The Sun Was Eaten: 6 Ways Cultures Have Explained Eclipses

solar eclipse, sun, moon, astronomy, space

How Do You Tell the Difference Between Total, Annular, Solar, and Lunar Eclipses?

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

Venus, view of the northern hemisphere based on observations made by the Magellan spacecraft. The Maxwell Montes, Venus' highest mountain range, is the bright spot just below the center of the image. The Montes, and the dark areas above and to its left,a

5 Weird Facts About Venus

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

A Timeline of the World in 8 Maps

gear: Related Content

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Photos and Videos

Study how a series of gears in a waterwheel translates a stream's energy to a millstone

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Topics

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