Book finished

Flowers for Algernon by Daniel Keyes
I was pretty sure I've read it before but it's 26 pages, so I figured I'd sit down for 20 minutes and make sure. Apparently there's a novel-length version? Anyone read it? Is it that much different, or is it just fluff over the top of the excellent short story? The Wikipedia article doesn't lead me to want to spend time reading it, really.
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