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How do they superimpose the first-down line onto the field on televised football games?

entertainment.howstuffworks.com/question225.htm

When a football game is on television, how do the broadcast stations superimpose the first-down line across the TV screen without it appearing on the uniforms of the players?

How do those yo-yos with the special clutches work?

entertainment.howstuffworks.com/question158.htm

Some of the newer yo-yos have a special "clutch" system that, when the yo-yo slows down, makes the yo-yo come up by itself. How does this work?

How does a Star Wars lightsaber work?

entertainment.howstuffworks.com/question171.htm

How do the lightsabers in the "Star Wars" movies work?

How does the Cave of Magic card trick work?

entertainment.howstuffworks.com/question187.htm

Will you please go to The Cave of Magic and tell me how this can possibly work? It has some of my friends convinced that we are being taken over by computers.

How Art Works

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"You see it every day, but what, exactly, is art? Learn about art and explore the huge collection of art now becoming available on the Web!"

How Blue Screens Work

entertainment.howstuffworks.com/blue-screen.htm

When an actor dangles over an incredibly deep river gorge, blue screen photography is what makes it look real. Find out how the blue screen technique works and why it's so convincing.

How Ice Rinks Work

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The things people do on ice rinks are so spectacular, we sometimes forget how remarkable ice rinks themselves are. Maintaining a proper ice rink is a real feat of engineering. Get a behind the scenes look at this very cool technology.

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