Why Do You Laugh? Cry? Blush?

Scientific answers to why you laugh, cry, smile, blush, and get the butterflies? Featuring Amanda Lehan, Danielle Taddei, and Colter Harkins. Music: Watch: Why Do You Get The Hiccups? Goosebumps? Eye Twitches? Why Do You Get Brain Freeze? Pruney Fingers? The Chills? Info sources: Crying