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Podcast: BrainStuff
Episode:

How the Virtual First-Down Line Works
Category: Science & Medicine
Duration: 00:03:23
Publish Date: 2009-03-02 18:00:00
Description:

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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