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The differences between the U.S. and Britain are many, but in the wizarding world of Harry Potter, they're even more pronounced.

Alligators are some of nature’s oldest prehistoric predators. But what do alligators eat, and what is an alligator's natural prey?

The U.S. Navy's new subs will use photonics masts instead of periscopes. Learn how these imaging devices will work.

The Panama Canal has been one of the world's biggest engineering feats since it was built nearly by hand in the 1900s.

Steamships quickly replaced sails in the early 1800s. Learn more about the origins of steamships and the innovations that led to their creation.

The U.S. Navy SEALs exemplify unconventional warfare. Find out how conventional and unconventional warfare differ in this article.

The Giant of Kandahar tale tells of U.S. military personnel encountering a massive, red-haired humanoid in the mountains of Afghanistan.

What's required to vote in America? HowStuffWorks looks at how homeless people can vote in the U.S.

The face on Mars stunned observers in the 1970s. Learn if this formation is the colossus of a human face or simply an interesting rock formation.

If the U.S. government won't take a stand on the dangerous chemical, it's up to consumers to watch out for themselves.

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