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How Gas Masks Work

science.howstuffworks.com/gas-mask.htm

Gas masks are used to filter out harmful gas and particles from the air industrial workers breathe. Learn about gas masks and how gas masks are made.

T-62 Main Battle Tank

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The T-62 Main Battle Tank was the second generation of Soviet MBTs, based on the T-54/T-55. Learn about the T-62 Main Battle Tank at HowStuffWorks.

The Biggest Crab in the World, Plus 8 Enormous Contenders

animals.howstuffworks.com/marine-life/biggest-crab-in-the-world.htm

Known for their long legs, pincers and hard shells, most crustaceans are omnivorous scavengers, although some are predators or vegetarians. Either way, a steady diet can assist certain crab species in growing to incredible sizes.

How Deep Are the Great Lakes? And Why Are They Great?

science.howstuffworks.com/environmental/earth/geophysics/5-reasons-why-great-lakes-are-so-great.htm

The Great Lakes are named so for several reasons. HowStuffWorks looks at why the Great Lakes are so great, including their impressive depths.

How Fingerprinting Works

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Fingerprinting is a popular technique for identifying criminals and authenticating access. Learn about fingerprinting and its storied history.

10 Fictional Spacecraft We Wish Were Real

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In honor of Douglas Adams and galactic hitchhikers everywhere, we submit this list of 10 spacecraft that we hopelessly pine for. Mindboggingly beautiful!

How Helmet Cameras Work

electronics.howstuffworks.com/gadgets/high-tech-gadgets/helmet-camera.htm

Helmet cameras allow you to capture shots that would be impossible otherwise. Learn about cool uses for helmet cameras and how they work.

How Night Vision Works

electronics.howstuffworks.com/gadgets/high-tech-gadgets/nightvision.htm

Most of us instinctively think of darkness as a way to hide. Night vision has changed all that. So, how can you see someone standing over 200 yards away on a pitch-black night? Find out.

Is it possible to run a nuclear test without producing radioactive fallout?

science.howstuffworks.com/nuclear-test.htm

In what may prove to be the first nuclear explosion since 1998, North Korea claims it has conducted an underground test of a nuclear weapon.

Do all creatures sleep?

animals.howstuffworks.com/animal-facts/all-creatures-sleep.htm

Are you wondering do all creatures sleep? Check out this article and learn if all creatures sleep and other information on the sleep cycle.

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