How the Virtual First-Down Line Works
from BrainStuff Hosted by iHeartPodcasts
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. Learn more about your ad-choices at https://www.iheartpodcastnetwork.com
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This episode was published on March 2, 2009.
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