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The Stuff of Genius- Blueprints

Why are blueprints blue? Before the days of copiers and electronic documents, duplicating documents was a time-consuming, arduous task. Learn how John Herschel's blueprints changed the face of the modern world -- and why they're blue -- in this podcast. http://howstuffworks.com http://www.facebook.com/StuffofGenius http://itunes.apple.com/us/podcast/the-stuff-of-genius/
Length: 02:51

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