Dan Lewis is a writer who sends out a daily email called "Now I Know". "Now I Know" is a daily nugget or two of information/trivia that is well written, well researched and very engaging. I've been a subscriber for years and can't recommend it enough.
Today's nugget involves explorers Meriwether Lewis and William Clark, their western explorations and how we know where they were. Or at least one place where they were. Based on mercury.
Here's the web version of the article. The website contains the "Now I Know" archives. There goes the day.
http://nowiknow.com/the-gross-metallic-secret-behind-americas-westward-expansion/
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