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...think is key to understanding why we find them unsettling. I found that there were three particularly eerie combinations of facial expression, and these were the ones which mirrored a clown-like appearance. In two images the mouth was smiling, but the eyes were displaying quite a different emotion of either anger or fear. In one, the mouth is sad and but the eyes are...

...think too much about the reasons why we do things. Once a norm is in place, people generally adhere to it because it makes life easier. Just as much as personal norms regulate individual behaviour, shared norms regulate activities in large social groups and prescribe what is allowed, what is prohibited or just frowned upon. Most countries hold sufficient stock for people...