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very cool rotational kinematics problem-can you predict the price is right spinner. 

Molecules is an application for viewing three-dimensional renderings of molecules and manipulating them using your fingers. You can rotate the molecules by moving your finger across the display, zoom in or out by using two-finger pinch gestures, or pan the molecule by moving two fingers across the screen at once. These structures can be viewed in both ball-and-stick and spacefilling visualization modes.

This is a great explanation of why they always land on their feet. Since we can't bring in live cats to demo this, what could we do? Perhaps we could get students to record them doing this at home with their cats and have them offer an explanation. They could slow the video and draw lines through the axis of rotation and study it more closely in class.

One more great animation with a vector explanation as well. This one pulls in additional concepts that students should understand.

simple way to measure the rotational speed of a home-made motor using a voltage probe