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Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)

Falling Stars: 10 of the Most Famous Endangered Species

Poker game. Card game. Royal Flush in poker. Hearts suit gambling

Poker Hands Ranked

Happy, smiling, flying pig

7 Everyday English Idioms and Where They Come From

Figure 13: A Maxim machine gun, belt-fed and water-cooled, operated by German infantrymen, World War I.

7 Deadliest Weapons in History

Cathedrale St.Jean in Lyon, France has a 14th-century astronomical clock that shows religious feast days till the year 2019; Perpetual Calendar

Ten Days That Vanished: The Switch to the Gregorian Calendar

Illustration for Demystified "How Dangerous is Quicksand"

How Deadly Is Quicksand?

Dancers at a Cinco de Mayo festival at the Mission District, San Francisco, California. (Photo dated 2019.) holidays

Is Cinco de Mayo Mexico's Independence Day?

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Topics

mineral processing uraninite bauxite lump ore fines refractory ore argentite hematite laterite galena gossan placer deposit metallogenic province hydrothermal mineral deposit vein porphyry copper deposit nugget replacement deposit

Key People

Georgius Agricola.

Georgius Agricola

German scholar and scientist

Johan Vogt

Johan Herman Lie Vogt

Norwegian geologist

Quiz

James Watt as a young man, c1769. Scottish engineer and instrument maker. Invented the modern steam engine which became the main source of power in Britain's textile mills. His engine had a separate condenser in which steam from the cylinder; (see notes)

Weaponry, Energy, and Power Systems Quiz