Without entering the fray, permit me to point out that Dr. Trivers' --the Sociobiologist at Harvard -- email address differs from the Trivers who has posted on the thread concerning molecular clocks.
In addition, Dr. Trivers does not usually end his letters with "Cheers" -- or the initials RLT.
Unless Dr. Trivers posts otherwise, I'll assume that this is not the famed Sociobiologist.
Best Regards,
Dr. K. Lee Lerner
Associate Fellow, Institute for Strategic Studies, Washington
and the Science Policy Institute, London