Unpaywall is a browser extension available for Firefox and Chrome that allows the user to find free, legal access to academic articles that would otherwise require purchase of the article in question. From the extension description in the Chrome web store:
This blog contains mostly essays about various LIS- or EMS-related things. Posts for a specific class (e.g. INFO 281, Crisis and Disaster Health Informatics), will be categorized by course code (i.e. INFO 281). LIS-related things will go in the category Lisemily and EMS-related things go in the category Diesel Therapy. The Off Topic category denotes posts inspired by a class, but not in response to a specific assignment or activity. Posts that follow up on a previous post are, predictably, found in the Follow Up category, and reviews of platforms and services are, also predictably, filed under the category Reviews.