Up until last week, searchers could use the plus sign on Google to tell the search engine that particular terms must be on the page for which they’re searching. For example, if I wanted to search for craft magazines that mention crochet, I could put [magazine +crochet], without the brackets, into the search box. I can’t use that strategy anymore. Since this is still a useful function, Google co-opted quotation marks to take it over. You may recall that quotation marks in Google indicate that an exact phrase must be present; you can now use them for a single word. So my search would now be in …