can ipod nano plays video?

what's the different between the previous version of nano's with the new one?

The first generation ones were white or black with plastic faces and chrome backs and at 1 2 or 4gb capacity. The second generation ones are all aluminum and come in silver blue green pink red and black and have 2 4 and 8 gb capacity The third generation ones are shorter and wider then previous generations with a brushed aluminum face with chrome back come in 4 and 8 gb capacity and the colors are. Silver blue green red and black.

i see :) now i know that mine is the 2nd generation. thanks for helping me :)