The timing of this is eerily appropriate for me. Some of you may be aware that Andrew Lange, a professor of physics at Caltech, committed suicide last week. (His NY Times obituary is here: <a href="http://www.nytimes.com/2010/01/28/science/space/28lange.html" rel="nofollow">http://www.nytimes.com/2010/01/28/science/space/28lange.html</a>) I taught Physics 1 with Andrew for three years when I was just starting grad school, and knew him not only as a brilliant scientist and excellent teacher but also as an incredibly warm, supportive, and positive person. I would never, in a million years, have guessed that he would someday take his own life.<p>I was nowhere near as close to Andrew as Tom was to Dan, but for the first time I understand, in a small way, the pain and confusion Tom must have endured (and, in diminished form, must still be enduring). Thank you, Tom, for sharing Dan with us.