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Continue to ChatI was writing a book about sustainable energy, and a friend asked me, 'Well, how much energy do you use at home?' And I was embarrassed. I didn't actually know. - David J. C. MacKay from https://whatsmyquote.com/quote/i-was-writing-a-book-about-sustainable-energy-and-a-friend-asked-me-well-how-much-energy-do-you-use-at-home