It only takes 7 muscles to smile, but 67 muscles to frown. This is thought to be linked directly to the fact that simpletons smile so much, whereas more intelligent manly characters often frown.

In a recent test, volunteers were airlifted into a jungle area containing predatory large cats to see what effect this would have evolutionarily. In every scenario, the smiling group of Downs syndrome children were all devoured, whereas the group made up of lumberjacks and disgruntled maverick cops always survived.

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