Brain Wave by Poul Anderson is $1.99 at Amazon. I read this one several years back and remember really enjoying it.
Quote:
As Earth passes out of a magnetic field that has suppressed intelligence for eons, the mental capacity for all mammals increases exponentially, radically changing the structures of society.
A mentally impaired farm worker finds himself capable of more delicate and intelligent thoughts than he ever dreamed. A young boy on holiday manages to discern the foundations of calculus before breakfast. Animals that were seen as livestock and pets can now communicate clearly with their owners and one another. And an already brilliant physics researcher now uses his boundless intellect to bring humankind to the stars—even as his wife plunges into an existential crisis. For all of them, the world will never be the same . . .
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