We’re almost able to build better human beings. But are we ready?

The surge of innovation that has given the world everything from iPods to talking cars is now turning inward, to our own minds and bodies. In an adaptation from his new book, “Radical Evolution: The Promise and Peril of Enhancing Our Minds, Our Bodies — and What It Means to Be Human,” Washington Post staff writer Joel Garreau looks at the impact of the new technology….