Now, brain cells aren't physically connected, but molecules called neurotransmitters do travel from one cell to another, using chemical pathways to transmit signals between cells.
It's worth emphasizing that two de vector inputs are very different animals from these three D vector outputs, living in a completely separate, unconnected space.
Looking down from a high altitude, the islands in front of us do not seem to be connected with each other, but they are known as the Seven Connected Islets.
So although it's around 60 hertz, at any moment in time these three different areas, because they're not connected to each other, will be going at a slightly different frequency.
The banks meeting behind were bare of a hedge, save such as was formed by disconnected tufts of furze, standing upon stems along the top, like impaled heads above a city wall.
Your brain would be pretty useless if it weren't hooked up to the outside world. That's where the peripheral nervous system comes in, which we'll be spending the next few lessons exploring.
I have spent the last three years working with the people who run state prison systems, and I can tell you that nobody likes the fact that people are stuck in the system because databases aren't talking to each other.