A time traveler goes back to the time before the dead of Archimedes. He saves Archimedes and allow him to have a few followers that continue his work and invent a few new idea in Mathematics and Chemistry. One of the idea allow later people in Rome to develop Chemical weapon which they use to kill huge part of the European population. When your time traveler is back in our time, it finds out that non of current progress ever happen (e.g. finding electricity) and the world population is around 10 million people living like ancient Romans.
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