"They laughed at Einstein. They laughed at the Wright Brothers. But they also laughed at Bozo the Clown." -- Carl Sagan
You're posting more than five items here.
(But it also looks to me like someone is creating multiple accounts, coming through, and downvoting all recent comments. Other users, please look over recent comments and repair if this is the case.)
A monthly thread for posting any interesting rationality-related quotes you've seen recently on the Internet, or had stored in your quotesfile for ages.