Has over one million full text articles based primarily on Elsevier journals. Covers the entire gamut of science. In using it, at the first screen, select group-wide login rather than personal login. On the next screen you may want to select the subject area, e.g., chemistry or civil engineering, or keep it at the default, ScienceDirect, which covers oall categories. Click the Search button.
Basic search is the default but advanced search is an option.
The main difference is that you supply the Boolian connectors. For most people the basic search would be preferable. You can also select where you want to search, title, abstract, full text, keyword. The default is abstract, title, keyword. This would be suitable to start the search.