Why haven’t we detected a signal from intelligent aliens yet?

Cypress said:
To the high school and college educated, the title of the article is obviously speaking about the subset of life that may be sentient and technologically advanced.

They are not writing about microbes, lower animals.
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As usual, you didn't answer the question and instead, engage in your usual flailing, deflecting and misplaced arrogance.

How do we know they are intelligent?
 
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