Mindless brutality? No, it's the spiteful gene: "The Smug Gene: Why are cats so smug, when ducks are all but incapable of it? While isolating the smug gene in humans is some way off, scientists have had some success producing genetically-smug wheat, which sits in a field all day looking extremely pleased with itself. Anti-GM protesters have labelled the wheat 'very irritating'."
