>> you're very good at this, i'm so impressed. are you resetting it? >> yes. >> that's our special page. >> the magic page. >> this is wonderful guys. can i take a picture with you? >> yes, what camera do we look at. >> the annual white house science fair where kids from across the country show off their inventions in an effort to bettered world, or to maybe just shoot a marshmellow across the room. he made waives in a mini hydro electric power demonstration, and he consulted with the super girls who created a page turning machine out of legos.