Ben's Brain

We were sitting on the couch last night and it was getting dark....I put on the light and sat back down beside Ben and he turned and asked me if his pupils had gotten bigger since I put the light on. I looked in his eyes and said yes they have gotten bigger and I asked if he learnt about that in school today to which he replied "no I learnt it afew weeks ago - it was the day I grew a new dendrite.."