They let the brain know what movements the body is making.

But as you can see, the brain running it already knows how to walk.

But how does the brain know where these vibrations occur?

As every brain knows, intelligence is not the most coveted quality in high school.

How does the animal's brain know what it is seeing?

Even if you don't know which commercial bin to put his work in, your brain knows exactly how to enjoy it.

Really, with all your educated brains you ought to know better.

Wow, it's not like anyone with half a brain didn't already know that.

But the brain does not yet know it is seeing an apple.

She'll pick your brain clean before you know she's had her fingers in it.