If you have just an afternoon to spare for your first visit to the British Museum in London, you have a choice to make. You can trot smartly up and down the corridors, trying to glimpse as many items as possible, or you can choose to linger thoughtfully in a handful of rooms, hoping to absorb a sense of the entire collection's scope. In his role as tour guide to the complete history of physics, Roger Newton seems to have had trouble deciding which strategy to adopt.
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