What have you changed your mind about? Why?

From the blog, Language Hat, I read this:
Edge.org has published their Annual Question (which they ask a bunch of smart people), and this year it’s "What have you changed your mind about? Why?"

The answers, coming from "some of the most interesting thinkers of our world," are thought-provoking. For example, Douglas Rushkoff, a media analyst, wrote that he thought the internet would change people. Instead, he writes, "Sadly, cyberspace has become just another place to do business."

I will be spending a lot of time on this site.