Specialist search engines

Specialist search engines can be useful. For example, Google Scholar is useful for tracking down academic articles and books, though the results aren’t always comprehensive, and the full text is not always freely available. Wolfram Alpha [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] is a specialist search tool for finding data. If you are concerned about privacy, DuckDuckGo is a general search engine that (unlike Google) doesn’t track your personal information or provide you with personalised search results.