at and just about all other websites use cookies to improve the way they work for visitors. You decide whether you want to accept cookies or not. Here is some general information on cookies, what they do and how they are used.

Cookies are small text files that websites store on your computer, mobile device or tablet for varying lengths of time. They are used to improve your browser experience, for statistical analysis, to provide advanced functions, to simplify logging in and personalization, and – though not here at – for providing targeted advertising.

At, we use cookies to compile statistics and analyze how people use our website and to provide some functionality that makes the site easier and better to use. The cookies here are never used to identify you personally. And we do not use cookies to target advertising.

Cookies are often divided into different types. Some, called session cookies, only last until you leave the website. Other cookies are stored longer on your computer. These “persistent” cookies can last for different lengths of time. Some last 30 minutes, some for a few months, and some last for years. These ones are used for statistics and analysis.

Your choice

You decide how you use cookies, by adjusting the settings on your browser. If you disable or delete all cookies, you will not have access to all the functionality on the site. Most popular browsers allow you to refuse all cookies, to accept them only from trusted sites, or to accept cookies from the websites you are using at any particular time. In most browsers, you can find these settings under “Options” or “Preferences” or under the spanner symbol.

The cookies we use at

We use two different types of cookies on Both of them are third-party cookies, i.e. they are created by other companies that provide services to

Google Analytics, a web analytics service provided by Google, uses four different cookies which are stored on your computer for varying lengths of time. These collect anonymous information including the number of visitors to the site, where the visitors came to the site from and the pages they visit while they are here.

The _utma cookie remains on a computer for two years or until the cookie cache is cleared. It tracks anonymous user behavior, such as first visit and last visit.

The _utmb cookie lasts for 30 minutes and the _utmc lasts until the end of your browser session. They work together to calculate the time a user spends on the site, the first showing when you arrive and the second showing when you leave.

The _utmz cookie indicates where a user was before they came to It might have been a search engine like Google or Bing, on a social network site, or just straight from entering the address. It shows geolocation data too (roughly where you are). If the visitor searched for a keyword, it stores that as well. This cookie lasts six months and is probably the most important Google Analytics cookie.

For more information on the cookies used by Google Analytics, visit their site.

Then there is one type of cookie that helps with social media and content sharing. The AddThis social bookmarking widget lets visitors bookmark and share our site. It generates the __atuvc cookie. It is created and read by our JavaScript on the client side in order to make sure the user sees the updated count if they share a page and return to it before our share count cache is updated. No data from that cookie is sent back to AddThis and removing it when disabling cookies would cause unexpected behavior for users. You can get more information at AddThis.