Cockroaches are often associated with dirty kitchens and grimy bathrooms – scuttling away as soon as you enter the room and turn on the light. But pest controllers aren’t the only people interested in them – these insects are inspiring research into antibiotics, robots and mechanical limbs, writes Mary Colwell. In Havana the native bright green Cuban cockroach is often kept as a pet and the insect even appears in old folktales. In one story,…