You can teach a baby calculus
but first you must teach him precalculus

If you want to teach a baby precalculus
you must first teach him functions

If you want to teach a baby functions
you must first teach him algebra

If you want to teach a baby algebra
you must first teach him arithmetic

But by the time you’ve taught him all that
he isn’t a baby anymore

 

You could wait until he is a man
to teach him arithmetic

But then you must wait until he has learned arithmetic
to teach him algebra

And if you must wait until he has learned algebra
you must wait to teach him functions

And if you must wait until he has learned functions
you must wait to teach him precalculus

And if you must wait until he has learned precalculus
you must wait to teach him calculus

But by the time he has learned calculus
he has a baby of his own
still waiting to learn arithmetic

And you can teach a baby calculus
but first you must teach him precalculus