Readers of this blog will have to indulge me from time to time so that I can respond to personal attacks from creationists. I write about science, and I strive to do so accurately. I also point out misinformation about science and explain why it’s wrong. So when someone claims I can’t admit a mistake when I make one, or that I suffer from an overactive imagination, I have to respond.

The Discovery Institute, which promotes Intelligent Design, tried to cast doubt a couple weeks ago on a transitional fish-tetrapod called Tiktaalik. The author of the post, Casey Luskin, wanted to convince us that despite the claims of scientists that it had a wrist, it didn’t seem to have one. His