Interesting article. A nit that can be picked is that it is not generally true that electrical signals in copper travel slower than c. The reason the signal tra

Interesting article. A nit that can be picked is that it is not generally true that electrical signals in copper travel slower than c. The reason the signal travels slower than c in an ethernet cable is that the copper is surrounded by dielectric material, and it is the presence of the dielectric that slows down the signal. If the 10BASE5 coax cable was filled with air instead of foam, the signal would travel at c.