86de5828_User_Tips__SERP_URL_Parameters__Description
[URL Parameter] pws [Format Example] http://google.com/search?q=cheese&pws=0 [Description] 
Turn off personalized results. PWS stands for “personalized web search”. Previously you had to be logged into your Google account for search results to be personalized. Not anymore. Personalized results are given to all — whether signed in or not — based on 180 days of search activity linked to a cookie in your browser. Why hassle with turning off personalization, when you can simply append &pws=0 to the Google SERP URL and retrieve non-personalized results from Google for that query.
Google Power User Tips: SERP URL Parameters
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