Trebuchet links:  Yurly's Trebuchet Page, Tabletop trebuchet -describes the parts

For the piano-launching trebuchet video clip, navigate to where my drop box is!

Rube Goldberg links:  Rube Goldberg machine, Honda Cog (or try this one:  Honda Cog ), Office Rube Goldberg

Pan Pipes:  Note: there is an ERROR in one of the notes of the pan pipes.  D should be 293.7 hz not 393.7 hz.