This Smarter Every Day guy is pretty funny. He is also very smart while also being the kind of person who can explain the complicated in ways that simple folks such as me can understand. Here he shows and teaches us why none of us can ride his bicycle that has an extra gear beneath its handlebars. This engineer discovers that although he had the knowledge he did not possess the understanding needed to ride the push-me-pull-me bicycle. He learned that knowledge does not equal understanding.
That was nuts. Wait until you see the next video below.