We’ve all been there: seven browser tabs open, a half-written email staring us down, and a smartphone buzzing with a “quick” notification—all while we’re supposedly “locked in” on a high-priority project. We call this multitasking, and we wear it like a badge of modern productivity. But here’s the cold, hard truth: your brain isn’t a supercomputer capable of running parallel programs; it’s more like a spotlight that can only illuminate