a while back, someone posted a link to this youtube video of the antikythera device made out of legos: http://www.youtube.com/watch?v=RLPVCJjTNgk here is an interesting (58 minute) bbc documentary that explains in more detail how the device actually works, as far as we know today: http://www.youtube.com/watch?v=-rUsgL2VGeU many of the gears had a prime number of teeth. this was very helpful in figuring out what the device was used for, and how it worked. here are several shorter videos that might also be of interest: The Antikythera Mechanism - 2D (8 minutes) http://www.youtube.com/watch?v=UpLcnAIpVRA The Antikythera Mechanism - 3D (4 minutes) http://www.youtube.com/watch?v=L1CuR29OajI Antikythera mechanism working model.mov (4 minutes) http://www.youtube.com/watch?v=4eUibFQKJqI in case anyone passes through bozeman, montana, there is a great computer museum that has a replica of the antikythera device. the museum also has an old ibm 1620 computer, a curta calculator, and many other neat old things: http://www.compustory.com/ note: their rather primitive website doesn't do the place justice! bob baillie