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How can ozone be both good and bad?

science.howstuffworks.com/environmental/green-science/question162.htm

During the summer I am always hearing about ozone warnings in my city. This ozone is bad. But then I hear about the ozone layer, which is good. How can ozone be both good and bad?

Hypersonic Speed Explained: How Hypersonic Planes Work

science.howstuffworks.com/transport/flight/modern/hypersonic-plane.htm

Higher, farther, faster: NASA's X-43A plane is destined to set new speed records. What sets the X-43A apart from other rocket-powered aircraft is that it is powered by a scramjet engine. Learn all about it.

How Tire Pressure Gauges Work

auto.howstuffworks.com/pressure-gauge.htm

If you have a car, chances are you also have a tire-pressure gauge. Learn how this pen-sized device measures air pressure and why the little stick inside doesn't just fly right out the back!

Messerschmitt Me 262

science.howstuffworks.com/messerschmitt-me-262.htm

The great legacy of the Messerschmitt Me 262 is that it inspired other air forces to adopt the jet fighter as standard, and moved engineers to utilize its layout for fighters and airliners. Learn more about this top World War II fighter plane.

Jackie Gleason Sees a UFO

science.howstuffworks.com/space/aliens-ufos/jackie-gleason-ufo.htm

The Jackie Gleason UFO tale begins with President Nixon inviting him to see aliens at an Air Force Base. He wasn't told any details and was sworn to keep the secret. Check out the Jackie Gleason UFO story.

North American P-51 Mustang

science.howstuffworks.com/north-american-p-51-mustang.htm

The North American P-51 Mustang spelled doom for the Luftwaffe. It was not only able to escort bombers on long-range missions and engage in dogfights, it could also drop and destroy the German Air Force on the ground. Read more on this pivotal plane.

El máximo concurso de Bob Esponja

play.howstuffworks.com/quiz/spongebob-squarepants-quiz-spanish

¿Están listos chicos? Participa en nuestro quiz para averiguar cuánto sabes sobre uno de los programas al aire más duraderos de Nickelodeon y su reparto único de personajes submarinos.

Can We Guess If You're Right-Handed Or Left-Handed?

play.howstuffworks.com/quiz/can-we-guess-youre-righthanded-lefthanded

Throw your hands up in the air for this quiz! Okay, you really don't have to do that. But telling us about yourself will point us towards knowing if you are left-handed or right-handed. Try us!

How Airplanes Work

science.howstuffworks.com/transport/flight/modern/airplanes.htm

More than 100 years ago the Wright brothers made their historic first flight in Kitty Hawk, N.C. Even after all these years, their creation still boggles the mind: How can something so heavy take to the air?

If You Get 23/30 on This Aviation Quiz, You Could Fake it as a Pilot

play.howstuffworks.com/quiz/you-get-2330-this-aviation-quiz-you-could-pilot-a-fighter-jet

You watched "Top Gun" and immediately knew that you'd do whatever it took took to become a dashing U.S. Air Force fighter pilot. But do you really have the right stuff to turn yourself into a knight of the sky?

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