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https://books.google.com/books?id=TFW2sI3zWI0C&pg=PA27&dq=thomas edison math&hl=en&sa=X&ved=0CDEQ6AEwBGoVChMI7afOtNedyAIVSdWACh3eWgME#v=onepage&q=thomas edison math&f=false