I have been thinking how convenient it would be to have my own personal time machine. Really could help me out with how busy I have been. However, I can't seem to get it to work quite right yet. I'm thinking if I had a bit more background in Quantum Physics it could be very beneficial at this time ... another one of those things in life you think you'll never need to know and then it turns out you really do in the long run. 2 1/2" long X 3/4" at the widest part and of course the arrows really spin.