This is my favourite video. I really enjoyed the video because it provided a detailed analysis of how the immune system works. Yet it is still quite simple and relatively easy to understand. The animations, are very unique and the video is educational yet interesting. This video has racked up 15 million views and has been published for 5 years. This is part 1 of the 2 Kurzgesagt – In a Nutshell published and I also recommend you checking out part two and all the rest of the videos. The Youtube channel has almost reached 10 million subscribers and almost all their videos a more than 1 millions views.