the arts, and because of that the teacher is indivisible from the subject they’re teaching. Without strong reference points and milestones, this is harder in self-learning. Science, on the other hand, is objective. You deal exclusively with proven facts and hard data. The speed of light, the physical makeup of elements on the periodic table, and the product of 2 × 4 are inarguable. You can’t really have an opinion about whether or not the answers are true; they are whether you like it or not. You can learn formulas and how to apply them—they will never change or let you down.

