This is a great tool for hunting down website information from the recent past (from 1996 on) that is no longer maintained on the web. The Internet Archive uses web crawlers to take selective snapshots of a wide array of websites and stores them for review even after the sites have been taken down by their original hosts. Note that it only covers a sampling of sites, and the frequency of snapshots is sporadic, so you will not always find what you're seeking.
Because the authors of Wikipedia articles are not named, it is impossible to determine their authority and expertise on the article subjects. While studies show that much of the information on Wikipedia is factually accurate, it is impossible to be certain about any given article at any given time. For this reason, we recommend that you do not cite Wikipedia as a source for your research.
Instead, we recommend that you use Wikipedia to introduce you to a new topic, and then go to an article's original sources to learn more. Do this by scrolling down to the bottom of the article to the sections entitled References, Sources, Further Reading and External Links. These will have links back to the original sources consulted to write the Wikipedia article.
We also recommend you click on the Talk tab at the top of the page to view discussions among the editors regarding proposed changes to the article over time. This will give you further insight into your topic and controversial issues therein.
Wikipedia is also a great place to find copyright-free images to use in your research.