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Nael5089 t1_iymptih wrote

Because humanity operates on a system of refreshing its population by means of reproduction. This results in new people needing to learn much of what humanity has already discovered. Many people happen to miss a lot of the information due to the necessity of surviving/not dying so when the info does finally reach them, it may cause them to be surprised.

Some people call this phenomena "the lucky 10000"

The idea being that every day 10000 people will learn something that many consider to be common knowledge.