Don’t confuse knowledge with intelligence.

Knowing what a trireme isn’t a sign of intelligence, it’s trivia.

Being able to figure out how to build a trireme is intelligence.

And I don’t mean looking up instructions and doing, I mean being able to reconstruct the knowledge from baser principles. This is not to say you or your son aren’t intelligent, just that knowing about triremes isn’t a sign of it.

Just a funny story. Exposure to vocabulary is an important factor in learning to think.