Science has to be open to new ideas; major scientific revolutions grow from roots that initially seem implausible. Yet for every unconventional idea that grows, there are thousands of proposals that sound kooky because they are kooky. Working scientists cannot spend all their time entertaining kooks. Unfortunately, some of the kooks scream that we are afraid to consider the possibility that we are wrong and they are right. We get our ordinary work done in part because a few brave types have fought the public battles.