We invented a phone without wires!
How will it work if there is no electricity? He needs towers every 20 km. It will not take off! What if all the towers exploded by terrorists?

We invented a cart without a horse.
What if the gasoline is running out? The horse can shake the grass. What if it breaks? Horses are rarely sick. What if all the gasoline exploded?

We came up with how to transfer data from one computer to another!
What if the computer is not connected to the network? No computer is currently connected to the network. What if the network exploded? Will the electricity end?