Yes -- things are hard, now, because we don't have the right models. Multiplication is hard when you're working with Roman numerals. Is it a problem with multip

Yes -- things are hard, now, because we don't have the right models. Multiplication is hard when you're working with Roman numerals. Is it a problem with multiplication, or our thinking? What's funny is that we think it stops there. "Oh, we made made multiplication easy, and negatives, and decimals, but Calculus... well that needs to remain difficult forever and ever.".