The book that introduced me to John Green writings, also my least favourite book so far (I've read Fault in Our Stars and Paper Towns). The title intrigues me but the story was so-so.... it's fun reading about young love but when you mix it with a formula too complicated to my non-scientific-thinking brain, it was all mush. But I must admit, there are a few interesting characters, like the Muslim best friend, and the first non-Katherine girlfriend. But it's booooring. If you haven't read anything from John Green maybe you shouldn't start with this.