Lead researcher Sarah Pressman PhD of the University of
Kansas explains,"It's not just that our brains are happy and make us smile, it can also be the opposite-- we feel the smile and become happy.".
In 1879, a Pressman at his factory didn't see that the press rule
was too high and it reportedly cut through thousands of small seed bags, instead of creasing them, ruining them all before production was stopped and the problem fixed.