When we cracked the genetic DNA code, opened the big Pandora's box, and it really did become possible to produce chimeras, my ears shot up. Having been brought up among the biologists and having followed various debates about ways to improve the human template and other debates about the true nature of our nature, I began seriously to wonder: What if? We hold in our hands a tool that is more powerful - for good or ill - than any we have wielded before.