Your brain is marvellously efficient. It requires only about 400 calories of energy a day — about the same as you get in a blueberry muffin. Try running your laptop for 24 hours on a muffin and see how far you get.

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Quote text and notes from Wikiquote: Bill Bryson (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.