Two months later on May 6, 2010, another open letter from 255 members of the U. S. National Academy of Sciences including 11 Nobel laureates stated that they were "deeply disturbed by the recent escalation of political assaults on scientists in general and on climate scientists in particular". They outlined scientific methodology and the conclusions of climate science, in contrast to "recent assaults on climate science and, more disturbingly, on climate scientists by climate change deniers." Regarding the mistakes found in the report, the letter expressed: