Biochemist and bestselling author Michael Behe explores the key missing factor in Darwinian explanations of the complexity of life in Episode 5 of his series Secrets of the Cell with Michael Behe. In this final episode, Behe gives a last consideration of the “X Factor” that appears to lie behind the wonderful, irreducible complexity of biology. That “X Factor,” he explains, is an intelligence inconceivably beyond our own.