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How the Metric System Works

science.howstuffworks.com/metric-system.htm

Ever heard of a little unit called a femtometer? Can you tell us how much you weigh -- in petagrams? We know you can't, so hurry up and start reading. We have work to do.

How the Mohs Scale Ranks Hardness

science.howstuffworks.com/environmental/earth/geology/mohs-hardness-scale.htm

The Mohs hardness scale is used by geologists and gemologists as a way to help identify minerals using a hardness test. How does it work?

How the Moon Works

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The moon is the Earth's only natural satellite and the closest celestial object. Learn about the moon and some of the theories about the moon's origin.

How the Navy SEALs Work

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Navy SEALs complete some of the most dangerous U.S. military missions. Learn about how the Navy SEALs work and what it takes to become a SEAL.

How the Northern Lights Illuminate the Night Sky

science.howstuffworks.com/nature/climate-weather/atmospheric/question471.htm

How does the aurora borealis (the Northern Lights) work? What causes it? Why can you only see it in the North? Are the myths about it producing sound true?

How the Orion CEV Will Work

science.howstuffworks.com/cev.htm

NASA needs a vehicle capable of carrying crew and payloads to Earth orbit, the moon and Mars. Learn about the basics of the new crew exploration vehicle.

How the Ozone Layer Works

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We hear about the ozone layer all the time. But, what is the ozone layer and what are the ozone layer's components?

How the Panama Canal Makes Water Flow Uphill

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The Panama Canal has been one of the world's biggest engineering feats since it was built nearly by hand in the 1900s.

How the Periodic Table Works

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The periodic table currently organizes more than 100 named elements and several unnamed ones. Learn about the periodic table.

How the Phonograph Revolutionized Sound Recording

science.howstuffworks.com/innovation/inventions/phonograph.htm

The phonograph transformed audio recording, leaving a lasting impact on how we capture and preserve sound. Learn about the invention's history and evolution.