What Is A Sandwich?

Today on Weird History Food, we are examining the definition of a sandwich. Is it an age old question, or an internet generated spark for the battle royale of keyboard warriors the world over? In the interest of convenience, people have always been looking to wrap up ingredients for easier eating. Was it the Earl of Sandwich that gave the sandwich its the name? ...And what of 'so called' hot dogs, wraps, and even those odd open faced 'sandwiches'? Well, go ahead, tell us what you think, and why!