His Hand Doesn't Even Move - Crazy free-handed dotted lines by professor in college on a chalk board ItMustBeCollege 1:54 13 years ago 67 623 654 Далее Скачать
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Newton's third law - Best Demonstration EVER !! - by Prof. Walter Lewin The PhysicsMaths Wizard 0:52 3 years ago 10 662 387 Далее Скачать
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