EDGE Question 2008: What have you changed your mind about?

I've been traveling in Central America for the past few weeks, so I'm late on blogging a number of things -- including this. Each year, EDGE.org's John Brockman asks a new question, and a bunch of tech/sci/internet folks reply. This year's question: What have you changed your mind about?
Science is based on evidence. What happens when the data change? How have scientific findings or arguments changed your mind?

I was one of the 165 participants, and wrote about what I learned from Boing Boing's community experiments, under the guidance of our community manager Teresa Nielsen Hayden: Link to "Online Communities Rot Without Daily Tending By Human Hands."

Here's a partial link-list of my favorite contributions from others:

Tor Nørretranders, W. Daniel Hillis, Ray Kurzweil, David Gelernter, Kai Krause, Clay Shirky, J. Craig Venter, Simon Baron-Cohen, Jaron Lanier, Martin Rees, Esther Dyson, Brian Eno, Yossi Vardi, Tim O'Reilly, Chris Anderson, Rupert Sheldrake, Daniel C. Dennett, Aubrey de Grey, Nicholas Carr, Linda Stone, George Dyson,Steven Pinker, Alan Alda, Stewart Brand, Sherry Turkle, Rudy Rucker, Freeman Dyson, Douglas Rushkoff .