The thought experiment evolved during the holidays, which freed my mind to cartwheel through the temple of logic. Exams had ended weeks before; Dartmouth College had forked over a diploma and booted me off campus; and I needed a breather before studying for postgraduate admissions tests. As the Stokes relation wriggled into my long-term memory, Bach boomed in my earbuds - and I began to imagine George Stokes playing Bach, in a band composed of history's great physicists.
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