Here's the writing-on-window video:
http://www.youtube.com/watch?v=YFmrlIEpJOEThis is a video of him talking Physics: http://www.youtube.com/watch?v=f2A7BlKbZlM
He appears to understand what he's talking about as well as any typical math/physics teacher. Whether he can come up with his own theories is not something I can tell just from these videos.