Tunnel Theory: The brain sends the signal to your leg to tell your leg to walk. So if we are the signal, like when we drive to the beach, then we go through the nerve tunnel. So if the tunnel gets a hole in it, then the water comes rushing in, and us (the signals) get flushed right out of that tunnel. Then we end up in the ocean swimming around an never make it to the leg where we were trying to go.

And that boys and girls is how my 6 yr old understands MS!