So your physical size is limited by geometry, and biology, and gravity. Your vocal and fragrant size can be bigger, but it’s still limited by the size of Earth. But your light—your personal glow—isn’t really bounded by anything. The photons that you are emitting right now—the ones that don’t get abosorbed by anything—have no reason to ever really stop. And they can continue conceivably past even the observable universe, making you, in a way, completely huge, and kind of immortal.

Michael Stevens aka Vsauce (x)