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Can two cans and a string really be used to talk over a distance?

science.howstuffworks.com/question410.htm

I was watching an old movie today, and two kids (neighbors) were talking to each other using two tin cans and a string. Does that really work? If so, why does it work?

How do they start jet engines on airplanes?

science.howstuffworks.com/transport/flight/modern/question411.htm

How do you start a gas turbine engine? What is the mechanism to begin the rotation of the large fan blades?

The Science of Shade: Unlocking Photochromic Lenses

science.howstuffworks.com/innovation/science-questions/question412.htm

How can my glasses change from transparent, when I'm inside, to dark when I go outdoors?

How does a movie clapperboard work?

entertainment.howstuffworks.com/question414.htm

What is the black and white board with a strip on top that movie directors use?

How do kosher foods work?

recipes.howstuffworks.com/question416.htm

When a food package says "Kosher" or "Pareve," what does it really mean? How do Kosher foods work?

How do trick birthday candles work?

science.howstuffworks.com/innovation/science-questions/question420.htm

How do trick birthday candles work -- the kind that re-light themselves after you blow them out?

How do store coupons work?

money.howstuffworks.com/personal-finance/budgeting/question426.htm

How do store coupons work? How does the store get its money back?

Why Golf Course Grass Looks So Perfect

science.howstuffworks.com/life/botany/question428.htm

How can the grass on the greens at a golf course be so perfect? What are they doing that's different from a normal lawn? Could my lawn look like this?

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