Isaac has no fear. He's fallen off things more than the other 2 combined. He figured out a month ago how to climb up and down on boxes, chairs and couches. I shouldn't have been surprised that he was so adventurous at the park today. He wanted down right away and started climbing. Anna was climbing with him. He went right up to the slide and started to head down on his tummy, head first. He LOVED it! He zipped down and as soon as I picked him up (I caught him halfway down), he was grunting and reaching for more!!