Biochemists".  The Candidates' mind closed like an iron trap. Not even the names of the 4 gray beards appeared on the blank screen. This last question remained unanswered as the candidate was ushered out of the room. Somehow Chris arranged for a passing grade in spite of this fiasco. Thank you again Chris, as I have on the anniversary of that exam every year since 1949. By all of us, most for more important reasons, you will be sorely missed.