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HowStuffWorks - Learn everything you wanted to know about science and more!

Science Puzzles
See how fast you can put together these science-themed puzzles.
5 Sci-fi Weapons That Might Actually Happen
Over the years, the science-fiction genre has amassed an impressive arsenal. Waltz through its fictional armories, and you'll find armaments spun from every scientific breakthrough, crazy theory and "Popular Science" article that sci-fi authors could get their hands on.
Top 5 Explosion Videos
Explosions can be devastating. What happens when volatile substances rapidly combust?
What are chemtrails, and should you fear them?
If you look up in the sky on a clear day, you're likely to see cloudy trails billowing from an airplanes. Although they're officially called contrails, some people refer to them as "chemtrails" -- and have interesting explanations for their existence.
Japan's Nuclear Crisis
Explosions, fires and dangerous radiation levels have dominated the headlines since the March 11 earthquake and tsunami sparked a nuclear crisis in Japan. How did so many safety measures fail?
More Science Stuff
HowStuffWorks Science has explanations and colorful illustrations related to earth science, life science, and other wonders of the physical world.

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