I recently started reading a book that my son had brought home from school.
It was quite interesting, but half way through reading, it disappeared. ( Went back to school)
I had a search, but can not find the book, or its title.

Storyline
Earth has been in a region of space which slows down human thinking.
As it emerges from the cloud/area people start to get smarter.
Clever people become genius.
Dumb people become very clever.
Even animals get smarter.

The book cover may have an image of a layered human head on.
ANY IDEAS?