@calestous I took my Univ. courses in math in a hall with 6 blackb's, 3 in width that could be moved up/down above/below 3 more. Exhausting!
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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@calestous Back when you could actually be injured doing physics.Thanks. Twitter will use this to make your timeline better. UndoUndo
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