Brain Wave

Brain Wave is a science fiction novel by American writer Poul Anderson, first published in serial form in Space Science Fiction in 1953, and then as a novel in 1954. Anderson had said that he could consider it one of his top five books.[1] This is one of many science fiction works written at this time on the theme of heightened intelligence.
At the end of the Cretaceous period, Earth moved into an energy-damping field in space. As long as Earth was in this field, all conductors became more insulating. As a result, almost all of the life on Earth with neurons died off, causing the Cretaceous–Paleogene extinction event. The ones that survived passed on their genes for sufficiently capable neurons to deal with the new circumstance. Now in modern times, Earth suddenly moves out of the field. Within weeks all animal life on Earth becomes about 5 times as intelligent. The novel goes through the triumphs and tribulations of various people and non-human animals on Earth after this event...
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