2 

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submitted by AQGVNg7cneZeRbfaewaoHFvTS8jC29uT8v
videos minutephysics explanations littlebits forces bicycles machines bike physics everyday physics
13 

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submitted by AYJ7gkhFpJAcRijH1GzzgzwBZ3J3u36NyJ
martin angelov mihail klenov urban transportation recreational device