"First principles". I mean, besides the whole pick and choose which first principles to teach and which ones to drop (there are a lot), they might not be as use

"First principles". I mean, besides the whole pick and choose which first principles to teach and which ones to drop (there are a lot), they might not be as useful as one may think When discussing limits, the tradicional way this is explained is pointless and extra annoying. And then you end up using limits for pretty much nothing after working with derivatives and integrals. So, again, nobody cares. And maybe someone can explain limits better than the "two dials" analogy because that's too much mathematical theatre that doesn't help when a good explanation is actually needed.