Event Announcement:I will be speaking at an upcoming meeting of the CFI Community of Southern Arizona in Tucson, Arizona on the afternoon of Sunday, February 18 (2007). This is open to the general public. People are expected to be seated by 1:30pm. My talk begins at 2pm and ends before 3:00, with Q&A until around 3:30 and socialization until 4:30, when I have to leave for the airport.The venue