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The fast growing field of synthetic biology, which involves the novel design or redesign of living matter, has opened a vista of techonological opportunities, from drug manufacture to producing biofuels. Jamie Davies considers the possibilities and controversies surrounding this exciting new science.

Where did I come from? Why do I have two arms but just one head? How is my left leg the same size as my right one? Why are the fingerprints of identical twins not identical? How did my brain learn to learn? Why must I die?
Questions like these remain biology's deepest and most ancient challenges. They force us to confront a fundamental biological problem: how can something as large and complex as a human body organize itself from the simplicity of a fertilized egg? A convergence of ideas from embryology, genetics, physics, networks, and control theory has begun to provide real answers....