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Extremophiles: How Do These Organisms Push the Limits of Life?

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Extremophiles are organisms that live in "extreme" environments. Learn why extremophiles are remarkable, not only because of their habitats.

How 'Planet Earth' Works

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'Planet Earth' is one of the most comprehensive and wide-reaching documentaries the Discovery Channel has ever produced. Take a look inside 'Planet Earth.'

How Stem Cells Work

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Stem cells can develop into every cell, tissue and organ in the body. Learn about stem cell research challenges and controversy and how stem cells can be used to treat disease.

How Earthworms Work

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Earthworms aren't just good for fish bait. Read about earthworm anatomy, reproduction and life as an earthworm at HowStuffWorks.

10 Insane Disguises That Actually Worked

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We're not talking about one of those laughable get-ups that celebs don when they want to go incognito for a latte. Nope, we're talking elaborate disguises -- from operatic to scientific.

How Woolly Mammoths Worked

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Hop in your time machine, set the clock back a few thousand years and meet some woolly wonders. They even have a few things to teach us about the fate of modern elephants.

How Your Skin Works

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You have lots of skin, but how much do you really know about it? Learn about skin components, skin color and everything else about your skin.

How 3-D Bioprinting Works

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Bioprinting is an offshoot of 3-D printing that aims to allow scientists and medical researchers to build an organ. Learn more about bioprinting.

Exploring Mars: Insights Into the Red Planet

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Since the 1960s, we've been captivated by the planet Mars. How different is our neighbor, and what have we learned about the most explored planet?

How DNA Evidence Works

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DNA evidence is explained in this article from HowStuffWorks. Learn about DNA evidence.

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