Why do any of us act the way we do? Is it our beliefs or our biology that shapes us? Lauren Grodstein considers this eternal question through the story of Andrew Waite, scientist, father, widower, struggling to raise two daughters, living with the ghost of his wife, facing a test of his faith in science. There are no easy answers here, just the honest complexity of human beings trying their best to be good people. The Explanation for Everything is moving, beautiful, and wonderfully funny.