In a letter to a colleague, Charles Darwin wrote of his doubts that something as wonderful as the human eye might be the product of natural selection: "The eye, to this day, gives me a cold shudder, but when I think of the fine known gradations, my reason tells me I ought to conquer the cold shudder." As biologist Richard Dawkins says of this remark, "Darwin...saw his doubts as a challenge to go on thinking, not a welcome excuse to give up." See this week's Musing.
Let me take this lovely Sunday morning to thank again all of you who comment here. There can't be many blogs with such thoughtful and instructive readers.