TIL Between 1920 and 2000 the man hours required to produce a ton of steel reduced by a factor of 1000.
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TIL Between 1920 and 2000 the man hours required to produce a ton of steel reduced by a factor of 1000.
![TIL Between 1920 and 2000 the man hours required to produce a ton of steel reduced by a factor of 1000.]()
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