To make this site work properly, we sometimes place small data files called cookies on your device. Most big websites do this too.

What are cookies?

A cookie is a small text file that a website saves on your computer or mobile device when you visit the site. It enables the website to remember your actions and preferences (such as login, language, font size and other display preferences) over a period of time, so you don’t have to keep re-entering them whenever you come back to the site or browse from one page to another.

How do we use cookies?

A number of our pages use cookies to remember:

  • your display preferences, such as contrast colour settings or font size
  • if you have already replied to a survey pop-up that asks you if the content was helpful or not (so you won’t be asked again)
  • if you have agreed (or not) to our use of cookies on this site
Google Analytics
The service is provided by Google and is used to collect anonymous statistics about web site traffic.
Cookies are used to recognize the computer on repeated visits to the site.
The data is stored on Google’s servers.
Read more on how Google handles the collected data.
If you want to opt-out of Google Analytics, you can install this browser plugin.
Google AdSense
The service is provided by Google and is used to show ads on selected pages.
Cookies are used to manage the ad delivery.
Also, information is stored about the user’s interests and demographics based on their browsing behaviour on this site, on other websites using Google AdSense, and on Google’s own sites. The information is used to show ads that are relevant to the individual user.
Read more about the so-called DoubleClick-cookie.
The collected information is not made available to
If you don’t want to get ads on this site based on interests or demographics, you can opt-out on this page.
Facebook, Twitter, Google+
These services are used for buttons that allow the user to like/follow on social networks.
Cookies are used to allow the user to use the buttons directly if you are already logged in on the individual services, and to collect statistics about user behaviour.
Read more in the privacy policies of the individual services:

Also, some videos embedded in our pages use a cookie to anonymously gather statistics on how you got there and what videos you visited.

Enabling these cookies is not strictly necessary for the website to work but it will provide you with a better browsing experience. You can delete or block these cookies, but if you do that some features of this site may not work as intended.

The cookie-related information is not used to identify you personally and the pattern data is fully under our control. These cookies are not used for any purpose other than those described here.

How to control cookies

You can control and/or delete cookies as you wish – for details, see You can delete all cookies that are already on your computer and you can set most browsers to prevent them from being placed. If you do this, however, you may have to manually adjust some preferences every time you visit a site and some services and functionalities may not work.