When I hold the spinning wheel, nothing crazy happens. When I flip it, I spin. With back, and I stop. Flip it. I spin. The question is, why am I spinning? So I have to force the wheel to turn over. Now, noon's third loss, as if for every force, there's an equal and opposite force acting as well. So when I force the wheel, the wheel is applying force equal and opposite onto me, causing me to turn. So the same thing applies when I'm on the ground, but the friction between my shoes and the ground, stop me from spinning. So another way to explain what's going on is through conservation of angular momentum. Now angular momentum is something that tells you how hard it is to either start or stop something from spinning. And it depends on two things. One, how fast it's spinning. We call that the angular frequency. Two, it's shape, or what we call the moment of inertia. So this wheel is rotating counterclockwise. Now I'm going to teach you a trick. So get your right hand. And I want you to curl your fingers in the counterclockwise direction. And you see that your thumb is pointing upwards. We'll call that the positive direction. So see this wheel has positive angular momentum with a magnitude about angular momentum is conserved. That means the long zone or outside forces, the total angular momentum of the system always stays the same. So when you flip this thing over and do the right hand trick, your thumb points down or in the negative direction. So the angular momentum of this wheel is now negative. So the whole system, me, the turntable and the wheel starts out at negative L. When you flip the wheel, the wheel now has positive L. So the whole system needs to stay at negative L because of conservation of angular momentum. So I need to spend with angular momentum of negative 2L. That's why I spend the other way.