Some Google tricks

Lifehacker has posted a list of ten tricks in Google. Did you know you can get the local time anywhere, track a specific flight and limit image searches to faces only right from the search box? Well, you can. Some of the other "tricks" are a little less impressive. The article claims using the phrase "better than" in a search is a trick. For instance, if you are looking for a book that is similar to but better than Harry Potter search for "better than Harry Potter." Unlike most of the other tricks, this isn't an actual command, just an arbitrary suggestion. There is one good command, the tilda ("~") mentioned. Tildas are used in equations to indicate approximation, and they are used the same way in Google. For instance, a search for "~college" returned results including college, colleges, NCAA, and graduate school highlighted.