On attending a conference on the Jovian satellites at UCLA, I heard Lou Lanze- rotti vigorously present the exciting data on the sputtering of water ice by Me V protons taken with W. L. Brown at AT&T Bell Labs. In his inimitable way he made clear that this new electronic sputtering process was very poorly under- stood and was very important for surface properties of sattelites. I was immedia- tely hooked, and have been working ever since with Lanzerotti,...