As other posts have said, there are no “double majors” at harvard, but you can concentrate (major) in one field plus another. Or you can concentrate in one field and then also do a secondary field (minor). Further, Harvard does not admit students based on chosen major the same way a school like Cornell or CMU would. Pick one thing you feel most aligns with your interests, and then don’t worry about it until you have to declare your concentration and devise a course of study sophomore year.
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