>"Just as zero degrees celsius is a special number in thermodynamics," wrote Fredrickson in Positivity, "the 3-to-1 positivity ratio may well be a magic number

>"Just as zero degrees celsius is a special number in thermodynamics," wrote Fredrickson in Positivity, "the 3-to-1 positivity ratio may well be a magic number in human psychology." I can't tell if he does or doesn't understand thermodynamics.