How the Virtual First-Down Line Works

Released Monday, 2nd March 2009

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How the Virtual First-Down Line Works

Monday, 2nd March 2009

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Virtual first down lines are used to indicate where play resumes in football -- but how do they work? Listen in as Marshall Brain explains how the technology superimposes a virtual line in this podcast on HowStuffWorks.com.

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BrainStuff

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Whether the topic is popcorn or particle physics, you can count on BrainStuff to explore -- and explain -- the everyday science in the world around us.

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