Pebble in the Sky by Isaac Asimov
My rating: 4 of 5 stars
This is my favorite one in the Galactic Empire series, and you don't need to read the other two to understand this one. It's basically unrelated except that it exists in the same universe.
This story is about the intersection of racism, science, religion, intergalactic colonialism, and biological warfare. So it's a pretty advanced little novel.
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