X-link to the DRM-free thread for the new Humble Bundle:
Humble Book Bundle Science Fiction by Real Scientists presented by textbook publisher Springer contains in addition to speculative works with scientific explanation afterwords, a number of dedicated non-fiction titles at the top tier, which may be of use to those interesting in learning more about the real life science behind popular science fiction concepts, and also a writer's guide specifically for incorporating medical information into one's sfnal stories and medical thrillers.
ETA: There's one non-fiction title at the $1 tier about genetic engineering as portrayed in popular novels and films, and the real facts behind it.