Aren't Myths Just Truths That Evolved Over Time?

At his blog The Rough Guide to Evolution, Mark Pallen has a post shooting down 10 myths about Charles Darwin. "There are many suppositions masquerading as facts -- for example, how many times have you seen it written that Darwin suffered from [Chagas] disease or his daughter Annie died from tuberculosis, when there is no way anyone can make a definitive diagnosis in either case," he writes. Some of the myths revolve around Darwin's religious views, a possible connection to Karl Marx, and his eureka moment brought on by finches (they were mockingbirds, Pallen says).