“We have the illusion that laughter is a choice, that we speak laughter as we speak any other word. But we don’t speak hah-hah when we laugh. It’s an involuntary action,” says Psychology Professor Robert Provine in a compelling new video exploring why humans laugh. The video is part of The Atlantic Video web series. Provine narrates the video and it’s broken into parts including segments on the anatomy of laughter and the danger of laughter. During one portion of the video, Provine visits The Commons at UMBC and conducts an experiment simply by sitting down and observing the people around him. …