public void remember(){
        zeroBeings.clear();
        for (Being being: beings){
            if (being.isHuman()){
                zeroBeings.add(new Human(being.getX(), being.getY()));
            }
            if (being.isZombie()){
                zeroBeings.add(new Zombie(being.getX(), being.getY()));
            }
        }
    }