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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.

What Are the Nitrogen Cycle Steps?

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The nitrogen cycle is the system by which nitrogen is converted into different chemical forms, some usable to humans and animals and some not, as it circulates among the atmosphere, the land and the oceans.

What is the origin of life on Earth?

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What is the origin of life on Earth? Learn about theories of evolution and the origin of life on Earth at HowStuffWorks.

How Do Bacteria Reproduce?

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Bacteria are both friend and foe to humanity. They cause and cure health problems, make rotting food stink and give sourdough its delicious taste. Find out how these countless tiny microbes accomplish all of this and more.

How Long Can My Succulents Survive Without Water?

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Succulents can go days on end without any fresh water. Learn the secret that succulents carry to get them through the dry spells.

Animal Classification: A Taxonomy for All Living Things

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The taxonomy that Carl Linnaeus introduced in "Systema Naturae" set the stage for a uniform animal classification system.

The Real Difference Between Plant and Animal Cells

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While plant and animal cells are strikingly similar, there are a few key differences.

The Fungi Amongi Are the Great Decomposers

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Fungi are extremely diverse organisms with a penchant for dead things. HowStuffWorks gets to know them.

5 Things You Didn't Know About Your Belly Button

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HowStuffWorks explores little-know facts about belly buttons, like why there is lint inside and why some people don't have a navel.

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