How the Virtual First-Down Line Works

BrainStuff

English - March 02, 2009 18:00 - 3 minutes - 3.16 MB - ★★★★ - 1.6K ratings
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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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