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How Much Does It Cost?
The quest for something that gives you light after the sun goes down drove people to do all kinds of things. The writer Harriet Beecher Stowe said making candles from animal fat was seven times as bad as washing clothes. Bill Nordhaus, an economist at Yale a while back, got obsessed with this question. He decided he wanted to calculate exactly how expensive light was thousands of years ago and how that cost changed over time.