How do you get a rat to laugh? Telling a joke won't work, but scientists say a rat will laugh when tickled--and they're not joking.
When Dr. Panksepp tickles rats' bellies, the animals appear to laugh, and their giggly behavior suggests that humans aren't the only mammals with emotional lives, he told The Huffington Post.
“It has long been clear that deep subcortical brain regions are evolutionarily related (homologous) in all mammals, and since rat-laughter is strictly a lower brain process (as in humans), this indicates that we share a form of social-joy with other animals
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