Science communication isn’t always easy, especially if you are trying to get across the mind-boggling complexity of immunology or climate change in a 10 minute video. But Philipp Dettmer, the founder of science YouTube channel, Kurzgesagt (German for “in a nutshell”), believes scientific topics don’t have to be hard to understand. 鈥淓verything complicated is only complicated because someone is bad at explaining it鈥�, he says. Kurzgesagt videos have received billions of views and now Dettmer has written his first book, Immune, in which he brings to life one of our most complex biological systems.