"I remember with pleasure the years that we were together as graduate students and
staff members in the California Institute of Technology, and also that we are both
members of Delta Upsilon. I have sometimes mentioned to people that your DU spectrophotometer
was given that name because of Delta Upsilon, but that was just a surmise on my part." Linus Pauling. Letter to Arnold O. Beckman. January 8, 1986.