Dr Cat can teach anything that can be taught. He taught Parabolas, then Dr Cat taught about Earthquakes. Now he teaches how rainbows are formed. Then Dr Cat even teaches about plants. Enjoy! --Larry828 __________________________________________Of course none of this would have been possible if Paddle2See hadn't made the wonderful project "Perpetual Slinky" which has all the working parts of Dr Cat's appearances. Thanks again to Paddle2See! ---And I urge everyone to go back to that original project to see its greatness for yourself.