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Have you ever wondered why the human body looks the way it does? Why our hands have five fingers instead of six? Why we walk on two legs instead of four? It took more than 350 million years for the human body to take shape. How did it become the complicated, quirky, amazing machine it is today? Your Inner Fish delves deep into the past to answer these questions. Premiering Wednesday, April 9, 2014, the three-part series reveals a startling truth: Hidden within the human body is a story of life on Earth.