Book excerpt: Did you know that two of every three people reading this book will die for reasons connected with the genes they carry? That our DNA gradually changes with age, which is why older parents are more likely to give birth to children with genetic defects than younger parents? That each individual is a kind of living fossil, carrying within a genetic record that goes back to the beginnings of humanity? In The Language of Genes, renowned geneticist Steve Jones explores the meanings and explodes the myths of human genetics, offering up an extraordinary picture of what we are, what we were, and what we may become. “An essential book for anyone interested in the development and possible future of our species.”—Kirkus Reviews “This is one of the most insightful books on genetics to date and certainly the most entertaining.”—The Wall Street Journal