To the team writing the Calculator app: I've just started taking a Personal Finance class and we were doing some calculations involving numbers above a million. I learned very quickly that when you're putting very large numbers into the Calculator app, it takes valuable time to keep making sure you have the right number of zeroes in every number. So I thought, "I would make so much sense to have the calculator have an option to turn on commas. So instead of 1000000, it would look like 1,000,000." I can just read that so much faster. And given how many other things in Android just make sense, I would suggest this as well.