Almost nothing is necessary. Frogs are not necessary. Calculus is not necessary. Yet these things exist, so we can ask what and how they are. You sense that yo

Almost nothing is necessary. Frogs are not necessary. Calculus is not necessary. Yet these things exist, so we can ask what and how they are. You sense that your own consciousness exists. so you can ask, what is this thing you sense? And what is this think sensing?