I walked in to the sun room this morning to hear 13 year old Ga'hoole Girl explaining the concept of Avogadro's number and mole (from our chemistry discussions) to Wild Man. Wild Man didn't quite get it: "Wow. That's a big number, like a billion!" Ga'hoole Girl was trying to tell him that there aren't even 6 times 10 to the 23 power number of people on earth - that it's a huge number. He didn't quite get it since he's still so concrete in thinking. But, what a great homeschooling moment!!