A nitpick - electrons travel very slowly in silicon (iirc on the order of a few metres per second), but electrical signals travel rather more quickly - around a

A nitpick - electrons travel very slowly in silicon (iirc on the order of a few metres per second), but electrical signals travel rather more quickly - around a half or two-thirds the speed of light (again, iirc.) Think of electrical signals like waves of sound through the air - the air particles don't move by any significant amount, but the signal propagation, is rather quick because of the speed at which movement is transmitted to neighbouring particles (and so on.)