Hi Mister Hwang,
For school I have to make a big project before I can graduate and it has to be about physics. I decided to take as issue for my projects the yoyo and who the toy works. But unfortunatelly it is very hard to find anything about this issue.
When I saw your site I hoped maybe you had handled the issue already, but you hadn't.
I would like to ask you if you maybe would take a look at the physical side of the yoyo. I would be very glad. Thanks anyway
BTW: I like your site very much
David Arnoldussen (Holland)
Gratis e-mail en meer: http://www.dolfijn.nl/