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The bearer of the soviet flag on this iconic picture wears a (looted) watch on each wrist.
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Here is a visualisation of how the different parameters of the Tsiolkovsky rocket equation play out: http://www.numberries.co/graphs/53b9dca83299a0863d000044. It's a web application that allows you to visualise a mathematical system as a graph, where each variable is a vertex, and dependencies of one variable from one another are edges.
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