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That’s true, but this is culture as defined by Internet traffic, which is pretty reasonable. Everyone knows a lot about the aspects of culture they care about, by definition, so it doesn’t make much sense to have a test for that.

I had this experience when I visited Madame Tussauds in London for the first time after about 20 years and I was like : "Who are all these people?".

What I remembered was a good mixture of artists and scientists from different epochs. Now they have crammed a few scientists in a dusty corner and the rest of the museum is full of people I don't recognize.

That's why it is called POPULAR culture, because that's what the majority of people know.