"At least once a week, I try to have one day where I have nothing planned so I can get up and just go back to bed and lay around and recharge my batteries."

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A reporter called on Edison to interview him about a substitute for lead in the manufacture of storage batteries that the scientist was seeking. Edison informed the man that he had made 20,000 experiments but none had worked. "Aren't you discouraged by all this waste of effort?" the reporter asked. Edison: "Waste! There's nothing wasted. I have discovered 20,000 things that won't work."

— Thomas A. Edison