James D. Watson

As a child, I lived with being punier than other boys in class. The only consolation was my parents' empathy - they encouraged constant trips to the local drugstore for chocolate milk shakes to fatten me up. The shakes made me happy, but still, all through grammar school, other kids shoved me around.

The science can tell you that the thousands of pseudo-scientific parenting books out there - not to mention the 'Baby Einstein' DVDs and the flash cards and the brain-boosting toys - won't do a thing to make your baby smarter. That's largely because babies are already as smart as they can be; smarter than we are in some ways.

Suppose that every prospective parent in the world stopped having children naturally, and instead produced clones of themselves. What would the world be like in another 20 or 30 years? The answer is: much like today. Cloning would only copy the genetic aspects of people who are already here.