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Screws and screw heads

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What is a simple machine?

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

Poker Hands Ranked

Drinking water is poured into a glass.

Water Fluoridation: Just the Facts

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

7 Deadliest Weapons in History

Shadow of a man holding large knife in his hand inside of some dark, spooky buiding

7 of History's Most Notorious Serial Killers

Amendments 1-10 to the Constitution of the United States constitute what is known as the Bill of Rights on an American flag.

What Is the Emoluments Clause?

Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

Happy, smiling, flying pig

7 Everyday English Idioms and Where They Come From

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Screws and screw heads

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screw thread wood screw power screw self-tapping screw setscrew machine screw cap screw lag screw Archimedes screw screw fastener spring wheel and axle flywheel brake lever bearing clutch shaft coupling governor pulley

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William Sellers

American engineer and manufacturer