Logical thinking
Sos called tonight - obviously missing Mamawland and all the occupants thereof. I had left a big chart laid out for Sophie and Keegan with the days marked and one piece of bubble gum for each of them for each day we were going to be gone.
Sophie went through the details of the chart with me, making sure she understood the concept. "So when the bubble gum is all gone, you will be home and I can come and spend the night with you, right? she asked me.
I assured her that was right and the first day the gum was gone, she could come over. There was a pause. A long pause. So long that I thought she had hung up on me and then I heard her say quite reasonably, "Then I am eating all of the gum today and I will see you tonight."