Hi, I tried readin up on HSW and another resource about how differentials in automobiles work... and i am pretty confused. http://web.mit.edu/2.972/www/reports/differential/differential.html at that site i found good diagrams of it. I understand why the "planet and sun" gears arent spinning when its going straight. but I do not understand why they do spin when its turning and why the two wheels get different speed... could anyone be kind enough to clarify this for me? thanx in advanced!