Commercials take up 27% of commercial television screen time and are the main source of income for TV and radio stations. In most cases, advertisements on all channels appear simultaneously, so don't try to change the channel, there will be commercials elsewhere, too. Nowadays they have also taken over the Internet. For a financial support, websites have to run ads on their pages, the largest share supplied and controlled by Google. Ads pry into your eyes, unceremoniously interfere with text, and on YouTube, in the most inappropriate places they cut into the action of films, lectures and concerts, tearing apart...