Six questions about the strange, surprising machine you’ve been walking around in your whole life — and almost certainly taking for granted.
Your first question:
Right now, deep inside you, there’s a pool of acid strong enough to dissolve a razor blade. (Researchers tested this. The blade came out 37% lighter.) Naturally, this raises a question: why doesn’t that acid dissolve your stomach? Part of the answer is that your stomach does something fairly drastic on a regular schedule. What is it?
