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Cookie policy

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


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.


Our pages set the following cookies:





Cookie type and duration



records if you have agreed to our use of cookies on this site

First-party persistent cookie; around 3 months



records whether your browser has JavaScript enabled

First-party persistent cookie; session



helps us to analyse which pages on the site are popular with visitors

First-party persistent cookie; session



We use some third-party services which may set their own cookies.

Social Media cookies

Some of our pages include social media share buttons that allow you to 'like' pages on social media platforms like Twitter and Facebook. You may see cookies from and

Addthis cookies:

  • loc
  • uvc
  • na_id
  • na_tc
  • ouid
  • ssc
  • uid

Twitter cookies:

  • tfw_exp
  • personalization_id
  • _twitter_sess
  • cto
  • guest_id

Analytics cookies

We use Google Analytics to collect information about how visitors use this site. Google Analytics collects information such as how often users visit this site, what pages they visit when they do so, and what other sites they used prior to coming to this site. Google Analytics collects only the IP address assigned to you on the date you visit this site. Google Analytics anonymises the IP address by removing the last octet (the last four digits) before storing it. It does not collect any personal information about you, such as your name or other identifying information. We do not combine the information collected through the use of Google Analytics with personally identifiable information. For more information read about Google Analytics data privacy and security. You may see cookies from

Google cookies:

  • _ga
  • _gat
  • _gid
  • _atuvc
  • _atuvs
  • 1P_JAR
  • ANID
  • HSID
  • NID
  • OGPC
  • SID
  • SSID

Hotjar cookies

We use Hotjar in order to better understand our users’ needs and to optimise this service and experience. Hotjar is a technology service that helps us better understand our users' experience (e.g. how much time they spend on which pages, which links they choose to click, what users do and don’t like, etc.) and this enables us to build and maintain our service with user feedback. Hotjar uses cookies and other technologies to collect data on our users’ behaviour and their devices (in particular device IP address captured and stored only in anonymised form), device screen size, device type (unique device identifiers), browser information, geographic location (country only), preferred language used to display our website). Hotjar stores this information in a pseudonymised user profile. Neither Hotjar nor we will ever use this information to identify individual users or to match it with further data on an individual user. For further details, please see Hotjar’s privacy policy.

Hotjar cookies:

  • _hjIncludeInSample - This session cookie is set to let Hotjar know whether that visitor is included in the sample which is used to generate funnels.

Media cookies

We embed YouTube videos on some of our pages. YouTube and its parent company Google set cookies when you visit a page that contains an embedded YouTube video. These cookies register anonymous statistical data on, for example, how many times the video is displayed and what settings are used for playback. No personal data is collected unless you log in to your Google account. You may see cookies from and For more information read about Google's privacy policy.

Youtube cookies:

  • GPS
  • IDE
  • PREF
  • YSC

We embed podcasts on some of our pages. The podcast files are stored on Soundcloud, a streaming service. You may see cookies from and additional cookies used by Soundcloud. For more information read about the Soundcloud cookie policy.

Soundcloud cookies:

  • UID
  • UIDR
  • sc_anonymous_id

We use Tableau to create and embed interactive maps and infographics on some of our pages. You may see cookies from Tableau. For more information, read their data policy.

Tableau cookies:

  • tableau_locale
  • tableau_public_negotiated_locale

We use Giphy to embed animated gifs in our articles. You may see cookies from Giphy. For more information, read their privacy policy.

GIPHY cookies:

  • __asc
  • __auc
  • __qca
  • _px2
  • _pxff_tm
  • _pxhd
  • _pxvid

We use Sketchfab to embed sketches on some of our pages. You may see cookies from Sketchfab. For more information, read their privacy policy.

Sketchfab cookies:

  • sb_csrftoken
  • sb_t_us



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.

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.