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Richard Walker, BSc, PhD, is editorial consultant and author of DK's Encyclopedia of the Human Body. Trained originally as a zoologist, Richard now holds a PhD in physiology and biochemistry. He has taught both secondary school and university students, and now enjoys a successful career as a writer and consultant. Among his human biology books for DK are the Guide to the Human Body, 3D Eyewitness Human Body, Visual Dictionary of Human Anatomy, and Brian and Body in the Megabites series.