Thanks for posting your thoughts on this-- I loved that exhibit (live tortoises!), and I had some of the same thoughts about his wife. (Though I'm afraid that the Slasher's Area of my brain had already been thorougly activated by some of the descriptions of Darwin's interactions with Captain Fitzroy on the Beagle-- the fiery arguments, their position as the only two educated men on board over the five year voyage, the deep expressions of high regard and affection in their letters (alas, I don't remember the exact quotes and the website doesn't seem to have included that bit)... it all seemed infinitely slashable to me.) I find myself wishing for a really good biography, or better, a fictionalized version...