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Amazingly, there isn't a lots of scientific research about how glasses can transform the way in which people see you -- instead of how they see what's facing them. But there's a high correlation with the Hollywood notion the fastest way to turn actors into giving the impression of scientists is always to make them wear a pair of not too flattering spectacles. For wild animals, showing teeth doesn't imply smiles on the camera and photographers. The only reason for their exposing teeth is because face-up with brutal situation leading to battles for food, dating mate and territory. These fightings are always very intense but it shows how nature occasionally works and indicates view of cruel life. To make a social world before photography, we'd have to make a world without picture IDs; without portraits of ordinary people; one without pictures as souvenirs of travel; one without celebrity pictures; one without advertising photographs; one without X-rays or views of outer space; your global without views of foreign and exotic peoples; one without pictures of sports, wars, and disasters; and something in which the great many people had no way to visually record the important events with their lives.