It's an oldie but goodie, and good as a mantra when things like Galileowaswrong.com pop up on the internet (no, I'm not making that a hot link, that level of ignorance shouldn't get the google rankings). If after 400 years there are still groups that refute centuries of evidence, it is little wonder that solid scientific findings of the last 50 years still have deniers and opponents. Given a couple more centuries, most will come around, and the rest, well, PT Barnum had a few things to say about them.