PARIS (AFP) - Robots of the future may able to climb up and down walls and zigzag across ceilings -- and the cockroach will be the one we should thank. One of the most reviled species in the book of life, the cockroach is also one of the most successful. Its design, honed by 300 million years of evolution, enables it to exploit a huge range of habitat niches, and its locomotion is notoriously fast and versatile. In a study published on Wednesday, University of Cambridge zoologists Walter Federle and Christofer Clemente say they can explain how the roach (Nauphoeta...