| − | The word count for the above letter is within the PNAS limit of 250 for the Text section, excluding the cc: list. The foregoing letter is to be sent by postal mail, return receipt requested, to PNAS, 500 Fifth Street, NW, NAS 340, Washington, DC 20001, by email to pnas@nas.edu , and by posting it in its feedback form at http://www.pnas.org/feedback . | + | The word count for the above text is precisely the PNAS limit of 250 for the Text section, excluding the cc: list. The foregoing letter is to be sent by postal mail, return receipt requested, to PNAS, 500 Fifth Street, NW, NAS 340, Washington, DC 20001, by email to pnas@nas.edu , and by posting it in its feedback form at http://www.pnas.org/feedback . |