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10 Highest Waterfalls in the World
Group X or Group Sex: What defines asexuality?
Animal Face-Off: Alligator vs. Black Bear
From Toilet to Tiller: Humanure
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Niagara Falls is impressive, but the highest falls in the world are more than 10 times taller. So where are they -- and why are they so rarely seen?

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Group X or Group Sex: What defines asexuality?

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In 2004, a study was published estimating that 1.5 percent of the population is asexual, lacking sexual attraction to anyone. Although it might be hard to perceive of sex being a moot point, a mere mechanical operation meant for reproduction, self-identified asexuals assure that it's a reality. Test your knowledge of life sans sex with this Asexuality Quiz.

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Animal Face-Off: Alligator vs. Black Bear

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The American alligator uses its formidable jaws to crush turtles, but find out how it will fare against another Florida native. Black bears are incredibly powerful and can be downright nasty as you'll see in this video from "Animal Face-Off."

From Toilet to Tiller: Humanure

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In the Western Hemisphere, many people might be considered fecophobes. When they go to the bathroom, they want whatever went into the toilet to be whisked away in a hurry. There are folks, however, with a different take. They believe what goes into the toilet should be turned into what's sometimes referred to as humanure. Find out how much you know about the issue in this quiz.