This weekend I was with my four year old when he asked what the thermometer said in the refrigerator case at Trader Joes. I told him, "Halfway between 30 and 40". He replies, "that is 35". Thinking he might know this just because he can tell time on an analog clock, I follow up with "What is halfway between 60 and 70" and he tells me 65. 'What is between 60 and 80?" He comes back with 70. What is halfway between 60 and 90? He tells me he doesn't know, thinks for a few more seconds and tells me 75. I ask him about halfway between 5 and 10? He tells me 8. I ask him if he's sure, he tells me 7, no 8. Maybe 7. :) Smart kid.