Under the limits tab, is a checkbox for "Links to Free Full Text." If you have this checked, all topics you search will provide free articles. Or type in your topic AND free full text[sb] in the search box if you want to search directly from there.PubMed Medline is like a menu--you look at the descriptions, decide what you want, but the actual food is in the kitchen. About 90% percent of the abstracts do not have the full article available online for free, but a small subset of articles are ready to print.
These come from(1) PubMed Central, the U.S. National Institutes of Health(NIH) repository of full text articles from studies that received NIH funding and 2) Publishers who decide to grant free access to particular articles(for whatever reason they choose).
This is a quick way to find an article, but remember that you are only looking at about 10% of the total articles in PubMed on your topic. Researchers are investigating what kind of effect this has on accuracy of results.
If you search all articles, on the results page, the free ones are indicated with green lettering, so you can pick them out.
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