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Jan 22, 2020 at 18:13 comment added David Hambling There only needs to be one sort of question that they're bad at -- which is the odd one out? can you complete this sequence of drawings? -- and you fill the test with those.
Jan 21, 2020 at 22:12 comment added VLAZ "Also, what sort of IQ do they have? A simple IQ test might weed them out." IQ tests are terribly unreliable when used against humans usually. It's possible that an alien could get a very weird score on an IQ test but it's also possible they won't really measure as "different".
Jan 21, 2020 at 18:19 history answered David Hambling CC BY-SA 4.0