Why is a banana bent? Why do galaxies spiral in the same way as the unfolding fiddleheads of ferns? Why is that very same curve found in the gyre of hunting falcons, the pearlescent shape of nautilus shells, the coil of a chameleon tail, the beak of a parrot and the talon of an eagle? Why do apples, papayas and pears hide a five-pointed star in their cross-section? What does the design of the universe tell us about God? If...