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During a speech to a rally, Donald Trump initially reassured a distressed mother with a crying baby, telling her not to worry - only to change his mind. "Actually I was only kidding, you can get the baby out of here," he said a few minutes later. Professor Christine Parsons at Aarhus University in Denmark has done a study on reactions to babies crying. She says primitive parts of our brains are activated by a baby's cry and that it can be very distracting when doing something complex, like making a speech. (Photo: A baby crying)