My ds 11 asked me this just a couple weeks ago. He is in his first year of middle school 5th grade. I asked him why, he just shrugged. I told him he would have to give me a good reason why (I figured it was kids at school comparing or something). He said he was reading an article on the top 10 IQ scores. He commented that his birthday was the same day as Stephen Hawking so he was just wondering. So I gave him the range answer, I got it from the Hoagies website. That seemed to be good enough.
He read A Brief History of Time about a year ago and did some Googling about Hawkings bio then. I think that got the wheels turning.
