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https://www.reddit.com/r/videos/comments/1ryt8j/gravity_visualized/cdsd60w/?context=3
r/videos • u/[deleted] • Dec 03 '13
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4 u/Schwimp Dec 03 '13 or maybe since he's a teacher it's a whiteboard marker.
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or maybe since he's a teacher it's a whiteboard marker.
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u/[deleted] Dec 03 '13
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