You can use most of the options we discussed in Google's Advanced Search Form in a regular search box query. If you're a frequent searcher or a "power searcher," this can save time because you don't need to open the Advanced Search page and fill in various boxes; instead, you can enter the refined query in almost any Google search box.
Live Search (formerly Windows Live Search and MSN Search) Microsoft's web search engine, designed to compete with Google and Yahoo!. Included as part of the Internet Explorer web browser. Demonoid: A BitTorrent tracker set up by a person known only as Deimos. The website indexed torrents uploaded by its members.
I think most students are familiar with using Google to search for things, so the interface is not a big stretch, as opposed to using other science specific databases available through the library. It does come down to what the objectives for the students are though, if you want them to find a few primary lit articles to include in a research project then Google Scholar would probably be just fine, but if you're objective is to get them ready for more grad level research then you probably want them to have to learn how to use some other databases ...