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How Holograms Work

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If you want to see a hologram, you don't have to look much farther than your wallet. But the most impressive holograms are large scale and illuminated with lasers or displayed in a darkened room with carefully directed lighting. Learn how a hologram, light and your brain work together make clear, 3-D images.

10 Ways to Stop a Killer Asteroid

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Killer asteroids are all fun and games -- until they're headed for earth. Luckily, scientists have come up with 10 ways to stop a killer asteroid.

10 Strange American Traditions

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Americans celebrate many traditions without even considering how strange the rest of world might consider them. What do you think are some of the weirdest?

14 Fantastic Facts About the Fourth of July

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Which three presidents died on July 4? What's the Horribles Parade? And, should America be celebrating on July 2 instead?

How Machine-to-Machine Communication Works

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Are you interested in M2M communications for automatic transmission and measurement of data? Learn more about M2M communications at HowStuffWorks.

Top 5 Green Robots

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There's nothing particularly organic about a robot, even if you dress it in hemp and fuel it with alternative energy. But these five can help our planet one mechanical movement at a time.

Neptune: An Ice Giant With Diamond Rain

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Neptune is the eighth planet from the sun and one of the coldest. Its supersonic winds are also the fastest in the solar system.

7 Reasons Alexander the Great Was, Well, Great

history.howstuffworks.com/historical-figures/alexander-great.htm

HowStuffWorks looks at the life and legacy of legendary Greek ruler Alexander the Great.

1461 - 1470