Earlier today, I was discussing with colleagues a problem in feature selection for logistic regression. I recalled that I had discussed the problem with Sam some months ago, and that he had a clever suggestion on how to approach it. I searched my email, and there it was. I read it, I read it again. I thought I got the main idea, but I was missing something. I wanted to ask Sam. He seemed to have seen farther, as he so often did. I needed his help. But I couldn't call him.
I fear re-reading Sam's messages. They are stolen rays from a receding star that I can never reach.