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How Astronauts Work

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Astronauts are adventurers and scientists who work in space. Learn who astronauts are and what they do in space and on Earth.

How Atavisms Work

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Atavisms are traits that are left over from a distant evolutionary ancestor. Learn more about atavisms and the controversy surrounding atavism.

How Atlanta Became the World's Busiest Airport, Again

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Hartsfield-Jackson Atlanta International Airport was just named world's busiest airport, again. What lands the ATL in the No. 1 spot again and again?

How Atom Smashers Work

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Atom smashers are used to help us discover what matter is made of. Learn about atom smashers and find out how an atom smasher works.

How Atomic Clocks Work

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When the power goes out and is later restored, how do you know what time to set your clocks to? Have you ever wondered how time is regulated? Learn how scientists determine exact time.

How Atoms Work

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Atoms are in your body, the chair you are sitting in, your desk and even in the air. Learn about the particles that make the universe possible.

How Auroras Work

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An aurora is a light phenomenon caused by solar winds interacting with the Earth's magnetic field. Learn more about auroras.

How Automatic Solar Panel Cleaning Systems Work

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Automatic solar panel cleaning makes solar panels far more efficient. Visit HowStuffWorks to learn all about automatic solar panel cleaning.

How Autopilot Works

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Autopilot is a sophisticated system that can perform the same duties that a pilot can. Learn about autopilot and find out how autopilot controls a plane.

The thought of an autopsy usually provokes fear, apprehension or extreme anxiety in people. Cut through the mystery of this process and learn the details of the preparation, procedures and tools used to perform an autopsy.