A cookie consists of information sent by a web server to a web browser and stored by the browser. This information is then sent back to the web server each time the browser requests a page from the server. This allows the web server to identify and track the web browser. We use Google Analytics to analyse website usage. Google Analytics generates statistical and other information about website use using cookies stored on users' computers. The information generated in connection with our website is used to create reports on website usage. This information will be stored by Google. Google's privacy policy is available here: http://www.google.com/privacypolicy.html . Advertisers or payment service providers on our website may also send you cookies. We display Google Adsense interest-based ads on our website. Google selects these ads based on your interests. To determine your interests, Google will track your online behavior using cookies. You can view, delete, and add interest categories associated with your browser using Google’s Ads Preference Manager, which can be found at http: //www.google.com/ads/preferences/. You can opt out of the Adsense partner network cookies at http: //www.google.com/privacy_ads.html . However, this opt-out mechanism uses a cookie, and if you delete cookies from your computer, your opt-out will not be saved. To ensure that the opt-out is saved for a specific browser, you should use the Google browser plugin, which can be found at http: //www.google.com/ads/preferences/plugin . Most browsers allow you to refuse all cookies, although some browsers allow you to refuse only third-party cookies. For example, in the Internet Explorer browser, you can reject all cookies by clicking "Tools" > "Internet Options" > "Privacy" and selecting "Block all cookies" (this is done by sliding the switch). However, blocking all cookies will negatively impact your ability to use many websites, including this one.