embarrassment, and Charles Darwin called
blushing “the most peculiar and most human of all
expressions”. Blushing makes it harder to lie,
which seems like a disadvantage. However, a 2009
study by Dutch psychologists found that we are
more likely to give people a second chance if they
blush when they betray us. The ability to blush acts
as a signal that you are sensitive to the social rule
you have just broken. Psychopaths, on the other
hand, do not blush at all.
