|When you are interested in exploring a subject, but you
don't know any specific sites to start with, you can use a search
engine. A search engine is a software program that goes out on the
web, seeking web sites and cataloging them. A search engine constantly
visits sites on the web to create a catalog of web pages and keeps them
current. Many search engines support the use of Boolean logic. Boolean
logic provides a means for combining terms using the "and"
"not" "or" words in between your terms to refine your
search. Keep in mind that when you use words with "and" or "not" you
reduce the number of results.
Hotbot is one search engine that supports the use of Boolean logic. In
this next example, we are looking for information on the hormone,
depression which is resistant to treatment.
We want to find records that combine all three terms, depression
and resistant and treatment. In this diagram, the resulting
list are those records falling into the yellow intersection of the 3
circles. Every time you add another search term, and another AND, your
result list will be smaller.
- Go to the search engine, alltheweb and click on the button, Boolean
and type in your terms in that second search box as follows:
- From your results list, select the link with the title: Treatment-Resistant
Depression sponsored by the MDDA. (Hint: In the results list,
look for MDDA in the green URLs. It was about the first screen's
results for me).
- Read the article and find the answer for the question