Elastic intestines and a need for turf-marking may be the drivers behind wombats' odd feces shape
                                
                                
                                    (Newser) -
                                    Poop comes in all shapes and sizes, but one kind of marsupial produces oddly symmetrical, six-sided feces that have had scientists scratching their heads. Patricia Yang, a mechanical engineering fellow at Georgia Tech, decided she needed to get to the bottom of why wombats expel poop cubes—the only known...