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- Richard Feynman on fire https://www.youtube.com/watch?v=N1pIYI5JQLE 2 comments
- Where does a tree get its mass? Richard Feynman explains. http://www.youtube.com/watch?v=N1pIYI5JQLE 25 comments
- Richard Feynman explains how fires work and where trees come from http://www.youtube.com/watch?v=n1piyi5jqle&feature=related 25 comments science
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