The best way to learn things is to teach it.

Normally to teach you have to have a willing subject to learn.

They also have to be willing to potentially be taught wrong by you.

Like people going for free haircuts at a beauty school.

But bots are willing and able to play the role of curious pupil, never getting tired.

And you can't hurt them by teaching them wrong; they have no memory and aren't actually situated in the world.