25 Jun '20 18:31>
@lemon-lime saidHere's another paradox.
A paradox is a scenario that doesn't work, and time travel is an idea that lends itself to paradoxes.
The grandfather paradox is a familiar one. If you go back in time and kill your grandfather before he has children, there will be no future you who could go back in time. You wouldn't exist because your father or mother didn't exist, but this is impossible because you were the one who caused your own non-existence.
It involves a time machine, and to a lesser degree a mad scientist with a secret agenda.
In the wee hours of the morning a time machine from the future materialises in the living room of an MIT grad, who has been up all night pondering the mysteries of life... i.e. he doesn't have a girlfriend.
The time machine opens revealing a traveler from the future. The time traveler explains the operating principles of time travel to the startled MIT grad, and then leaves him and the machine to go off and follow his true passion in life. He wants to remain in our time and live as a cabbage farmer on a bunny wabbit ranch.
So Derrick (the MIT grad) examines the machine, keeping in mind the operating principles of time travel, and in short time is able to built other working models. Knowledge of what he has done goes public, and Derrick is heralded as the inventor of time travel.
But he didn't invent the time machine, he simply built other working models of a time machine from the future.
And so here is the paradox... who invented the first time machine?
meanwhile, back at the ranch...
The time traveler from the future has settled into his new life as a cabbage farmer/bunny rancher. He gave up time travel to pursue his true passion in life... genetic engineering. And only time will tell if he succeeds in creating a new race of highly intelligent predatory man eating bunny rabbits.