(not our actual stairs)
Today Cal climbed the stairs. He went from not being able to get on one, to climbing all of ours in a few minutes. (I think we have around 15 or so) I was working on our halloween costumes (I'm excited about them) and realized he had disappeared. I found him 3/4 of the way up the stairs. I let him get to the top before I took him back downstairs to play. He was pretty happy.