News, Do you believe in little green men? Documentary Sparks Debate Over UFOs.
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The results (or lack thereof) from the SETI radio signal searches rule out the "N = large" possibility.
If you can bring yourself to look at something at cia.gov, this (https://www.cia.gov/library/center-for-the-study-of-intelligence/kent-csi/pdf/v40i5a09p.pdf - broken link) may make interesting reading.