Sky Horizon by David Brin, Scott Hampton (Illustrator), Scott Hampton (Illustrator)
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Interesting near-future SF pondering a "what-if" possibility regarding First Contact: what if a bunch of brainy High School students got their hands on the first alien? Not bad speculation and, in this short YA novel Brin's takes a lot of interesting turns... and THEN ends it with a cliff-hanger! Not bad, but.... geez! I want more and I want it NOW!