Our world is not just interconnected, but ever-changing, even if we can't sense it. While you're reading this, you're changing. You're aging (a minute amount, thankfully), but the neural networks in your brain are also imperceptibly changing as you perceive each word. Crucially, even when we're seemingly not doing anything of note, events are taking place outside your immediate surroundings that will change your life in the future, though you won't realize it yet. Heraclitus, the ancient Greek philosopher, rightly pointed out, "No man ever steps in the same river twice. For it's not the same river and he's not the same man." To that, Cratylus, a student of Heraclitus, added that we are not mere passive observers. When you step in a river, you change it. Nothing is static. Even microscopic changes add up over time.