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Question for JSD! What method do you use to almost immediately figure out the mass of the proton within 1% accuracy, so you haven't had to take the time and trouble to memorize it? Tantalizing hint (can be done in less time than it takes to ask the question), but I'm drawing a blank -- unless you remember other things more easily, and find m_p from them? (For example, the m_p/m_e ratio, or the nuclear magneton, or ....)/snip/