[This is part 4 in an ongoing series on our recent PLOS ONE paper on sauropod neck cartilage. See also part 1, part 2, and part 3.] Weird stuff on the ground, Big Bend, 2007. Here’s a frequently-reproduced quote from Darwin: It’s from a letter to Henry Fawcett, dated September 18, 1861, and you can read the whole thing here.