FRAGMENT FROM NATURE deals for two weekends on the evolution of the human foot. If someone presented me with a design for a human foot that looked like the actual human foot, I probably would have thrown them out of my office. Clunky, messy, bolt-on evolution is why the designs from robotics companies look nothing like the human foot: it was not designed from scratch with a single purpose. All about exaptation: the acquisitions of functions for which they were not originally adapted.