The Pause
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The Pause is a science fiction short story by Isaac Asimov. It was first published in August Derleth's 1954 anthology Time to Come and reprinted in the 1975 collection Buy Jupiter and Other Stories.
Alexander Johannison, a nuclear physicist working at the United States Atomic Energy Commission, is mystified when his Geiger Counter starts failing to detect radioactivity. Over a period of time, his colleagues also notice the same strange events, but when he finally reports to his boss, no-one will take him seriously and he realises that he is the only one who is still aware of the existence of radioactivity.
Thinking that maybe an enemy has removed all knowledge of nuclear energy and nuclear weapons and is about to invade the United States, he goes home and finds a stranger there talking to his wife. The stranger, who looks like an impossibly perfect human, explains that he is an entity from 'outside the Universe'. He has been assigned to performs an 'operation' on humanity to save them from a potential nuclear holocaust. As part of the operation, all knowledge of radioactivity has been removed from humanity for five years. Also, all radioactive elements no longer exist. After the Pause, about one hundred people, including Johannison, will have the task of re-educating humanity in the peaceful use of nuclear power.