Sam sat on my lap and looked at the keyboard on the desk. At first he tried to do the ABCs, but he was stymied by the QWERTY layout. So then he looked at the numbers. He started with 1 and counted up. As Scarlett did before him, he automatically said “10” when he got to the 0. I told him, “That’s not 10, that’s 0”. To which he replied, “Zero doesn’t belong here! It belongs here! [pointing to the beginning of the row of numbers]”.