epigenetic shifts continue throughout a person’s lifetime, and the overall pattern of these shifts appears similar within families.

What a person eats, what chemicals he or she is exposed to, and other features of a person's environment chemically modify chromosomes, thereby changing how genes are ultimately expressed. (p. 392)

Fathers share more than genes with their children. Where a man works, the chemicals he is exposed to, and even his age can leave a medical legacy for future children. (p. 200)

Standing over Darwin’s grave in Westminster Abbey, Andrew Feinberg had a realization. Feinberg, a genetics researcher at Johns Hopkins University in Baltimore, looked to the left and saw Newton’s grave. Just above Newton is a plaque honoring physicist Paul Dirac, a pioneer of quantum theory. Inherent in quantum theory is the idea of uncertainty in the interaction of subatomic particles. “So I look back at Darwin’s grave and it hits me; there’s nothing like that in biology,” Feinberg says. Nothing that deals with uncertainty. Yet there is uncertainty in biology. Gen... (p. 18)