The history of light (classic) : Planet Money
· npr.org · popularity 34/100 · 0 similar stories today
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Summary
How do you measure human progress? Light is the answer. For thousands of years, getting light was a huge hassle. You had to make candles from scratch. This is not as romantic as it sounds. You had to get a cow, raise the cow, feed the cow, kill the cow, get the fat out of the cow, cook the fat, dip …
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