Even commonplace foods can have a bit of intrigue. For example, take sausages and their mysterious casings, that skin-like material that holds the meat and other ingredients together. Are they edible?

In Too Afraid to Ask, we’re answering food-related questions that may or may not give you goosebumps. Today: What in the world is sausage casing made of? “How the sausage is made” historically had ...