Given the Google nonsense, I think it would be fun to give a little synopsis of C.L. Moore’s Greater than Gods.
Male babies are dying out, and a scientist is working on a means of using X-Rays to ensure a balance between the genders. More importantly, though, he’s trying to decide between Betty and Veronica (their real names are unimportant). His friend comes in and tells him how crazy it is that the future exists in a quantum state and how our choices can cause entire universes to come into or flash out of existence. Coincidentally, the scientist is psychically contacted by his future descendants at the same time… But they are from completely different timelines!
Short version, if the Doctor marries Betty, he spends more time with his beautiful but vapid wife, he has a kind and sensitive daughter, his work fails, and mankind slouches into a decadent feminist dystopia in which everyone is hippie-dippie and living in peace and harmony in little groves as all knowledge and technology is lost, dooming the race of man to end in a whimper.
If the Doctor marries Veronica, the sexy brilliant scientist gives him a brood of strong and virile young men, his work succeeds but leads to endless war and conquest of earth and someday the stars, with a mankind bred to rule and be ruled.
One of his lines of descendants will be wiped from existence, and he can doom mankind to a future of decadence and death or galactic immortality and perpetual war.
Given the choice between feminist dystopia and war world, he immediately proposes to his secretary instead, wiping out both possible futures and opting instead for the unknown.