Alright, intrepid adventurers! We’ve explored all the ways to keep your machine (a.k.a. your amazing body) running smoothly without a major overhaul. But what if, despite our best efforts with diet, exercise, and medication, your engine needs a little extra TLC? This chapter is your exclusive invitation into the mechanic’s bay, otherwise known as the operating room! Here, we’ll peek under the hood of cardiothoracic surgery, but fear not—we’ll keep things light and avoid turning this into a medical textbook.