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Ada fisikawan teoretis yang membayangkan, menyimpulkan, dan menebak hukum baru, tetapi tidak bereksperimen; dan kemudian ada fisikawan eksperimental yang bereksperimen, membayangkan, menyimpulkan, dan menebak. Asli: There are theoretical physicists who imagine, deduce, and guess at new laws, but do not experiment; and then there are experimental physicists who experiment, imagine, deduce, and guess.
