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7 Lessons From 7 Great Minds Have you ever wished you could go back in time and have a conversation with one of the greatest minds in history? Well, you can’t sorry, they’re dead. Unless of course you’re clairaudient, be my guest. But for the rest of us, we can still refer to the words they left behind. Perseus Digital Library Udacity - Advance Your Education With Free College Courses Online.url Khan Academy