There wasn’t enough of humanity left alive to tell the story. They fractured and struggled for survival soo hard all higher knowledge was lost. It was the poles suddenly shifting due to crossing the galactic median, the inner core of the earth pulls in and the crust slips violently like a shell on an egg slips around the yolk.The oceans don’t though, and the resulting inertia creates waves that cross the continents. 2 miles high by some research. 12000 years ago. And 12000 before that, and 12000 before that. And... With the magnetic field of earth weakening at a exponential rate, we lose all shielding against solar storms, one good sized sun fart and everything electronic is gone forever. There won’t even be a society left that could fix it. Suddenly shifted to the Bronze Age level of technology without being prepared for it will cause massive loss of life by starvation. Sadly, weapons will still work, and roving bands of thieves will try to exist as long as possible on raiding what stock stores and people have left. It won’t take long. Crops, like long predictable seasons, not whacky ass weather punctuated by extremes which is what you’ll have. Be prepared to find a way to live off grass consuming animals, as that’s about the only thing that will reliably grow. Who would teach you this? There were hardly no survivors, and it was soo long ago all non pyramid sized records were lost. The government knows, look up the Chan Thomas book. They have deep underground bases (city sized) and think that will be sufficient. It might....