This is a post to announce the death of Bike genius Sheldon Brown. In addition to being a father of two and a husband, he was a skilled bicycle mechanic who understood the physics and mathematics of bicycles, and who posted an extensive bicycle glossary that can only be compared in scope and organization to wikipedia. I highly recommend wandering around his site for a few hours, and then you will miss him too.
I just want to offer one more "thank you" to Mr. Brown for his work. I hope he understands how much the cycling community appreciates his efforts.