Just stumbled over a great resource: Science in Sci-Fi, Fact in Fantasy
From their website:
"Science in Sci-Fi, Fact in Fantasy is a blog series for authors and fans of speculative fiction. Just as science fiction often has roots in hard sciences — physics, astronomy, genetic engineering, microbiology — fantasy world-building relies on everything from economics to military strategy to animal husbandry."
Believability check for Science-fiction and Fantasy
Science- and history-related questions answered for Writers