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What's the difference between a semi-automatic weapon and a machine gun?

science.howstuffworks.com/semi-automatic-weapon-vs-machine-gun.htm

The term "semi-automatic weapon" is used in the U.S. media often. But what does it really mean? Is it just another term for a machine gun?

10 Hispanic Scientists You Should Know

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He built President Eisenhower an indoor golf-training machine, analyzed the Zapruder film and searched for an Egyptian pyramid's treasure chamber using cosmic rays. Aren't you dying to meet this wide-ranging scientist?

The Plan to Dig Up President James K. Polk — For a Third Time

history.howstuffworks.com/historical-figures/moving-body-president-james-k-polk.htm

What's behind the campaign to exhume and rebury the United States' 11th president? Learn more in this HowStuffWorks article.

How the GM Sunraycer Worked

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GM's Sunraycer was a solar car ahead of its time. Read the history of the sunraycer and why it almost took General Motors down with it.

16 World-Famous Architects and Their Impact

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We see buildings pop up and get torn down all the time, but some structures (and the architects who designed them) were built to last. These 16 are some of the most famous.

How 4D Printing Works

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Is 4D printing much different from 3-D printing? What if we told you some tech insiders are betting it has the potential to change industries from fashion to health care to defense?

Who Invented the First Computer?

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This person of diverse interests also invented the cowcatcher device for trains and held a distinguished mathematics professorship at the University of Cambridge.

10 Completely Wrong Sayings About Animals

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Ever been told you're as stubborn as a mule? It might be a compliment. Here are 10 completely wrong sayings about animals from HowStuffWorks.

10 Traits That Make Insects Survivors

animals.howstuffworks.com/insects/10-traits-that-make-insects-survivors.htm

If people had exoskeletons and wings maybe they'd be around forever, too. HowStuffWorks looks at 10 traits that make insects survivors.

Oak Ridge, Tennessee: America's Secret Atomic City

science.howstuffworks.com/oak-ridge-tennessee-secret-atomic-city.htm

The Manhattan Project built the city of Oak Ridge in rural Tennessee, where secret facilities produced uranium-235 for the atomic bomb.

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