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I just finished listening to the audiobook of Mark Kurlanskys <i>Salt: A World History</i>[0]. Fascinating and highly recommended.<p>[0] <a href="https://www.markkurlansky.com/books/salt-a-world-history/" rel="nofollow">https://www.markkurlansky.com/books/salt-a-world-history/</a>
What did they do for light?