Hi everyone. Uh before we start, let's do a time game. When I see one, let your right thumb and left. When I see two, switch hand. Let's your right thumb and left. Okay, I know it's a game. Some of you might know this correctly. Let's try this time faster. Ready? Two. One, two, one, two, one, two, one, two, one. >> [laughter] >> If you feel a little behind, that's okay. It doesn't mean your reaction is slow. There's a brain routine. We can see, understand, act into one hand. That's what we're talking about ...