John Wesley Marden

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Common, or southern, cassowary (Casuarius casuarius).

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

When Was the Periodic Table Invented?

Calendar marking march 15th

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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

After a perfect launch, spectators try to catch a last glimpse of Space Shuttle Columbia, barely visible at the top end of the twisted column of smoke.

7 Accidents and Disasters in Spaceflight History

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

A Timeline of the World in 8 Maps

Aphrodite. Greek mythology. Sculpture. Aphrodite is the Greek goddess of love and beauty.

12 Greek Gods and Goddesses

John Wesley Marden

American chemist

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isolation of vanadium

In vanadium
…VCl₂, and the American chemists John Wesley Marden and Malcolm N. Rich obtained it 99.7 percent pure in 1925 by reduction of vanadium pentoxide, V₂O₅, with calcium metal.
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