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What was the greatest invention of the industrial revolution? The automobile? The assembly line? The leaf blower? Wrong on all counts, says visionary Hans Rosling, who makes a compelling and personal argument for... wait for it... the washing machine. In this peppy presentation for TED, Rosling concludes that freeing his mother from the drudgery of hand-washing gave her time for things that improved, exponentially, the quality of life for her and her family. It's the holy grail of innovation.