Try a little test. Tell the barber’s paradox: “The barber shaves only those men in town who do not shave themselves! Who shaves the barber?”
1. If your listener takes this just as a laugh, he’s ignorant.
2. If he plays around with it for a while, he’s an intellectual
3. If he goes on thinking about it, saying ‘wait a second that’s >really< odd …’, he’s a real structural scientist*
*If he says ‘yes, I’ve head that a 1000 times’, he’s an educated structural scientist ;o)