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Darwin's last book was about earthworms, published just a year before his death. As part of his research, he spread some chalk on his yard, and dug it up 30 years later (!) to see how deeply it had been buried by the worms' burrowing activity. https://en.wikipedia.org/wiki/The_Formation_of_Vegetable_Mould_through_the_Action_of_Worms …
I also learned that Darwin's journal contains this amazing table, weighing the pros and cons of marriage. "Object to be beloved and played with—better than a dog anyhow, but *terrible loss of time*...less money for books etc" http://darwin-online.org.uk/content/frameset?itemID=F1497&viewtype=text&pageseq=238 …
"Never mind my boy—Cheer up—One cannot live this solitary life, with groggy old age, friendless and cold and childless staring one in one's face, already beginning to wrinkle. Never mind, trust to chance—keep a sharp look out.—There is many a happy slave—"
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