It seems so human, still laugh is not specific to humans. Monkeys, rats and dogs have already been found to enjoy a good "laugh". But it is hard to penetrate into their mind to see what a rat or dog could think when "laughing". Perhaps they think we, humans, are ugly... Anyway, laughing seems to be connected to a high development of the brain, and only some mammals are known to laugh. Laughing hyena surely not, nor the laughing dove.
It seems that we, the humans, have been able to laugh for...
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