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Re:The Mystery of People Who Speak Dozens of Languages by bunderbunder on Thursday August 30, 2018 @01:29PM (#17878704)
> Could they understand a complex news story about economics and finance in all those languages? Read a novel? Write an essay on a complex topic?

Those skills can't even be assumed in native speakers.

For example: https://nces.ed.gov/naal/

Re:The Mystery of People Who Speak Dozens of Languages by kazinator on Thursday August 30, 2018 @02:00PM (#17879037)
They can be assumed in high IQ native speakers, though.

These hyperpolyglots are supposed to be high IQ.

If you have a high IQ, but look like a low IQ illiterate in a dozen additional languages, then I'm afraid you're a phonyglot. This is because there are ideas that you can think but cannot say in those non-native languages; and if someone else were to say those things for you, you wouldn't understand what they are saying.