*A note on using the Internet for research:

When you use the Internet to gather information for reports or assignments, you need to educate yourself about the quality of  Web sites.  Who is sponsoring them? Are they selling something?  The URL may give some clue: .edu denotes an education site,  .org an organizational site,  .gov a government sponsored site, .com a commercial site.  ~ means a personal home page.  This can belong to anyone offering inaccurate information or to an expert in a particular field who has a personal site on a huge network.

See this slideshow for tips on evaluating websites.