Spiders are predatory invertebrate animals that have two body segments, eight legs, no chewing mouth parts and no wings. They are classified in the order Araneae, one of several orders within the larger class of arachnids, a group which also contains scorpions, whip scorpions, mites, ticks, and opiliones (harvestmen). The study of spiders is known as arachnology.
All spiders produce silk, a thin, strong protein strand extruded by the spider from spinnerets most commonly found on the end of the abdomen. Many species use it to trap insects in webs, although there alre many species that hunt freely. Silk can be used to aid in climbing, form smooth walls for burrows, build egg sacs, wrap prey, and temporarily hold sperm, among other applications.
All spiders except those in the families Uloboridae and Holarchaeidae, and in the suborder Mesothelae (together about 350 species) can inject venom to protect themselves or to kill and liquefy prey. Only about 200 species, however, have bites that can pose health problems to humans.[1] Many larger species' bites may be painful, but will not produce lasting health concerns.
Spiders are found all over the world, from the tropics to the Arctic, living underwater in silken domes they supply with air, and on the tops of mountains. In 1973 Skylab 3 took 2 spiders into space to test their web-spinning capability in zero-gravity.
Saturday, April 28, 2007
With nearly 937,000 titles on the IMDb it isn't feasible to handpick Recommendations for every film. That's why we came up with a complex formula to suggest titles that fit along with the selected film and, most importantly, let our trusted user base steer those selections. The formula uses factors such as user votes, genre, title, keywords, and, most importantly, user recommendations themselves to generate an automatic response.
We're proud of our system for, if you disagree with a Recommendation for a given title and know of a better one, we encourage you to help us improve the results. Look for the "Update" button or the "Add a Recommendation" link at the bottom of the page and add more relevant (or just plain more) Keywords, or add the titles that you think should be surfacing, and help make Recommends more useful, more appropriate, and more fun.
We're proud of our system for, if you disagree with a Recommendation for a given title and know of a better one, we encourage you to help us improve the results. Look for the "Update" button or the "Add a Recommendation" link at the bottom of the page and add more relevant (or just plain more) Keywords, or add the titles that you think should be surfacing, and help make Recommends more useful, more appropriate, and more fun.
Subscribe to:
Posts (Atom)