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Here is the most super-fantastic sci-fi/fantasy flowchart. It's so good. In high school, sf/f was my genre of choice, and I would totally have wanted this as a poster (I might still). Even if you're not into it, you'll like this because it's that very best of internet things, a Sassy Flowchart. Here's my favorite bit:
"I shall require at least ten" -- guilty as charged.