Guess what Paul, the level of intellect, or IQ, means your ability to operate with the static knowledge you have, to process it effectively... It doesn't mean the amount of static knowledge you have; you know how a genius is different to a moron? They may just know the same sets of facts, but a moron won't be able to use them for anything while the genius will use them to generate some brilliant ideas or make some genius discoveries.
As for that guy, him not knowing what that thing is does not demean his intellectual abilities in any way, and besides, given his profession, one would doubt he needs that particular knowledge in the first place.