When I was at school (a long time ago) they used to invite visiting lecturers to provide us with inspiration. One of these was a chap called Prof. Eric Laithwaite who gave a lecture on gyroscopes. His party piece was to lift a very heavy gyro over his head with one hand, a feat which would have been quite impossible if it were not spinning.
Out of curiosity I searched u tube to see if there was still any record of this, and sure enough:
YouTube - Eric Laithwaite - gyroscopic gravity modification.mov
There's more of Laithwaite's gyro lectures on u tube, though I seem to remember the lecture he gave to us A level students was rather more mathematical than the ones aimed at younger kids.
YouTube - Eric Laithwaite's lecture on gyroscopes part 2/7