What have you changed your mind about?

The Edge.org Annual Question for 2008, addressed to a select group of their choice of the intellectual elite, is "What have you changed your mind about? Why?" (I've done blog postings on the responses to questions of the two previous years: "What is your dangerous idea?" and "What are you optimistic about? Why?"

I started to do thumbnail summaries of the responses I thought worth passing on to you, but found that most were not very succinct, and sufficiently diffuse to make brief summary difficult. Then pack much less punch than the 'dangerous idea' responses. I recommend that you scroll through the responses yourself. I may focus on a few of them in subsequent posts.