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How Crop Circles Work

science.howstuffworks.com/science-vs-myth/unexplained-phenomena/crop-circle.htm

Are crop circles the work of alien visitors? Are they a natural phenomenon? Are they elaborate hoaxes perpetrated by some very dedicated humans? Learn how researchers try to separate the supernatural from the scientific.

Oppositional Defiant Disorder Overview

health.howstuffworks.com/pregnancy-and-parenting/childhood-conditions/oppositional-defiant-disorder.htm

Oppositional Defiant Disorder needs to be dealt with at an early age. Visit HowStuffWorks to learn all about Oppositional Defiant Disorder.

5 Ways Your Skin Changes as You Age

health.howstuffworks.com/skin-care/beauty/anti-aging/5-ways-skin-changes-as-you-age.htm

There are different ways your skin changes as you age. Take a look at five of the most noticeable ways your skin changes as you age.

Will Google destroy Microsoft?

computer.howstuffworks.com/google-microsoft.htm

Google and Microsoft are constantly locked in competition for the desktops and search results of the public. Learn more about Google and Microsoft.

How Virtual Surround Sound Works

electronics.howstuffworks.com/virtual-surround-sound.htm

Virtual surround sound mimics the effect of multi-speaker surround-sound systems. Learn about virtual surround sound and find out how sound is perceived.

How to Ask a Guy Out

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Want to know how to ask a guy out? Visit HowStuffWorks to learn how to ask a guy out.

How Paramedics Work

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Paramedics are trained in prehospital care and are often involved in emergency situations. Learn more about how paramedics save lives every day.

How Bats Work

animals.howstuffworks.com/mammals/bat.htm

Bats are the only mammals that can fly, and they live much of their lives hanging upside down. Learn about bat wings, bats and echolocation, bat caves and bat myths.

How Lasers Work

science.howstuffworks.com/laser.htm

Lasers are used in dental drills, eye surgery, tattoo removal, and (of course) laser pointers. Learn how different lasers generate such concentrated light.

How Air Purifiers Work

home.howstuffworks.com/air-purifier.htm

Americans spend an estimated $250 million annually on air purifiers for their homes. Learn why people buy air purifiers and how they work.

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