The notes about the most recent meeting are on-line at http://houston.pm.org/talks/2015talks/1504Talk/index.html The presentation is also available at https://www.youtube.com/watch?v=Gzx6KlqiIZE&feature=youtu.be G. Wade -- If you don't know where you're going, you will probably end up somewhere else. -- Laurence J. Peter