action advanced-technology advanced-weaponry adventure alien-technology aliens anthologies artificial-intelligence british categories colonization conspiracy contemporary crime cybernetics cyberpunk dystopian dystopian-society epic epic-adventure espionage existentialism exploration extraterrestrial-life extraterrestrial-races fantasy fiction firstcontact folk future-technology futuristic futuristic-society galactic-empire galacticempire galaxy genetic-engineering geneticengineering genrefiction hardsciencefiction historical humor indigenous interstellar-conflict interstellar-war irish kindleebooks kindlestore legends literature military military-science-fiction mystery myths nativeamerican occult otherreligions paranormal post-apocalyptic post-human practices religion resistance-movement romance romantic sacredtexts satire science-fiction sciencefiction shortstories space-exploration space-opera space-warfare spaceopera spirituality superheroes thrilling-narrative thrilling-plot timetravel tribal ufos unitedstates weaponry