Undid Don and I's work the sprites would not appear ojn the screen after the reorder

PyGame/practice/gameprac/hybrid.py

@@ -78,7 +78,7 @@ class Aliens(pygame.sprite.Sprite):
         self.move_counter += 1
         if abs(self.move_counter) > 75:
             self.move_direction *= -1
-            self.move_counter += self.move_direction
+            self.move_counter *= self.move_direction
 
 # create sprite groups
 spaceship_group = pygame.sprite.Group()