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If you aren't signed in to a Google Account, your search experience will be customized based on past search information linked to a cookie on your browser. 
To disable these types of customizations, follow these steps:

In the top right corner of the search results page, click the  gear icon, then select Web History.
On the resulting page, click Disable customizations based on search activity.
(Because this preference is stored in a cookie, it'll affect anyone else who uses the same browser and computer as you).

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