If you find an article on Google Scholar, but cannot find the full-text for free. Contact me, and I may be able to get the article through interlibrary loan. Do not pay for an article! Contact info below/right.
This is a general science database with sources from encyclopedias, journals, magazines, newspapers, and more.
JSTOR has a large collection of scholarly journal articles. (FYI, most recent articles in JSTOR are 5 years old.)
NY Times first-time user Account Creation (must use oprf email)
OPPL Database (requires library card)
This database has an incredibly large collection of scholarly journal articles, and is constantly updated with the most recent publications.