3-2-1 Contact - Communication - Trini Got Rescued/How an Old TV Works - Ep. 123 - 1980

In this episode of 3-2-1 Contact, Trini still got stranded in the desert until rescued by a Goodyear Blimp, Mark visits Bell Labs and see how a talking computer works and how our voices work. In addition, you will see how an old TV works which emit diodes (this is before HDTV comes into play).