Celebrated science journalist Carl Zimmer helps unravel some of the deepest mysteries surrounding our genetic blueprint and the traits that appear in generation after generation. Through the years and technological advancements we've learned that heredity isn't just about genes that pass from parent to child. It continues within our own bodies, as a single cell gives rise to trillions of cells that make up our bodies. Drawing on scientific research and his own experiences with his two daughters, Zimmer offers a fascinating new way to understanding heredity and who we really are.