We will miss you Al

I was very sad to learn that my UC Berkeley astronomy colleague Al Glassgold passed away on January 4, 2019. https://www.legacy.com/obituaries/NYTimes/obituary.aspx?page=lifestory&pid=191245407 I hope that a complete retrospective on his life and accomplishments is eventually published. Al and I occasionally co-taught an astronomy seminar over the years, and his expertise on