“We learned about Boomerang Technology in history, dad. Complicated, I didn’t understand all of it.”
“Boomerang? That takes me back to my childhood. Remind me.”
“Well… the teacher explained about when computers became fast enough to identify where something came from by its trajectory and direction of travel. And you could use that information to reverse it. The teacher said it became possible to send bombs, missiles, even bullets back at whoever fired them.”
“That’s right. What don’t you understand?”
“The teacher said it ended all wars.”
“Yes… so?”
“What’s war?”