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How Kaleidoscopes Work

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Kaleidoscopes have been fascinating people since the early 19th century. Whether you think of kaleidoscopes as toys or as works of art, no matter how often you look inside, you'll never see the same thing twice.

How Kill A Watt Works

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Kill A Watt is a new type of energy monitor. Learn about Kill A Watt.

How Kin Selection Works

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We're used to taking the phrase "survival of the fittest" to mean it's an "every man for himself" world. But some animals (like worker bees) sacrifice themselves to ensure their species lives on. Why would they do this?

How Krispy Kremes Work

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If you've ever tasted a Krispy Kreme original glazed doughnut, you know there's something special to these melt-in-your-mouth treats. How do they make a doughnut that's crispy outside yet soft inside? Find out.

How Kudzu Works

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Kudzu is explained in this article. Learn about kudzu.

How LED Incapacitators Work

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LED incapacitators are non-lethal devices used by law enforcement officials. Learn about LED incapacitators.

How LED Light Bulbs Work

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LED light bulbs have taken over the market. But what are their pros and cons?

How LRAD Works

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What makes sound a weapon? Review the basics of sound and discover exactly how the LRAD produces its "beam of sound." We'll also explore LRAD's hailing and warning abilities and other uses for sound.

How LSD Works

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LSD, also sometimes known as acid or Electric Kool-Aid, was the drug of choice for hippies. What made LSD so popular and what are acid trips like?

How Lab-grown Skin Works

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Lab-grown skin can improve the survival odds of someone with a serious third-degree burn. See how lab-grown skin is made and how it works.