In Ms. Keetch Psychology class today they were learning about the brain. How it works and how it is wired to send signals.
They were specifically learning about how the brain has an element of plasticity. It can learn something and then later modify what it has learned.
To demonstrate this concept with the hands-on learning approach that Ms. Keetch is so good at, she brought in a backward bike, or as we lovingly called it, "BB".
The thing about 'BB" is that when you get on to steer it you very quickly find out that the steering is opposite of what you have learned.