I would like to share a few features of Google search which may be very useful for us as teachers:

• Google Spelling: “Google's spell checker automatically defaults to the most common spelling of a given word, whether or not you spell it correctly.”  

http://www.google.com/insidesearch/features.html#spell

• Google Web-history: This website offers a log of the websites you visited, a timeline of visited websites and searching the timeline itself

http://www.google.com/history/

• Search by file type: “Search for specific types of files, such as PDFs, PPTs, or XLS, by adding filetype: and the 3-letter file abbreviation.”

http://www.google.com/insidesearch/features.html#filetype

• Specific site search: “Precede your query with site: if you know you want your answer from within a specific site or type of site (.org, .edu). For example: site:edu or site:nytimes.com”

http://www.google.com/insidesearch/features.html#searchsite

• Include or ignore words or characters: “Highlight common words and characters such as the and & if they are essential to your search (as in a movie or book title) by putting quotation marks "the" around them. You can also use the minus - sign to specify particular items you don't want in your results, like ingredients in a recipe.”

http://www.google.com/insidesearch/features.html#plus

And  my favorite:

• Fill in the blanks: “Put an asterisk * in a phrase or question you want completed and we'll fill in the blanks. For example, you can find the lyrics to a song even if you only remember a few words.”

http://www.google.com/insidesearch/features.html#numerical