2:21 The science of laughter 5:32 The science of laughter - Sasha Winkler 7:25 Is Laughter the Ideal Drug? | Medical Myths | Earth Science 0:28 Watch Rats Laugh As Scientists Tickle Them 7:49 Why Scientists Laugh at Creationists 3:11 Why Do We Laugh? The Science Behind Humor and Human Connection 0:16 Mad Scientist in Lab, Laughing, Pacing 3:03 Why Do Humans Laugh? The Science Behind Laughter 4:41 Why do we laugh? Science of laughter EXPLAINED!