Technology / Computers / Portal: A web site that aims to be an entry point to the World-Wide Web, typically offering a search engine and/or links to useful pages, and possibly news or other services. These services are usually provided for free in the hope that users will make the site their default home page or at least visit it often. Popular examples are Yahoo and MSN. Most portals on the Internet exist to generate advertising income for their owners, others may be focused on a specific group of users and may be part of an intranet or extranet. Some may just concentrate on one particular subject, say technology or medicine, and are known as a vertical portals.
Science / Biology / Portal System: An arrangement in which capillaries drain into a vein that opens into another capillary network. MORE
Entertainment / Literature / Science Fiction: Literature in which speculative technology, time travel, alien races, intelligent robots, gene-engineering, space travel, experimental medicine, psionic abilities, dimensional portals, or altered scie MORE