 Very important. Louis Pasteur started killing bacteria and food and drink. And it started with milk. And, you know, it prevents the spoiling of food and milk and drink. I mean, that's very important. That's huge. Look at this young lady on there with her milk mustache. Come on now. Mustache campaign? It would never have happened if Louis Pasteur didn't pasteurize things. Shout out to Louis. Well done, Rich. Number seven on this list. This helped me get through school. Oh, gosh. A calculator.