Philosophy, pop science, anything really. To me it's Hegel, Kant, Heidegger and other similarly wordy authors. If one wants a challenge, which books are hard and worthy? by bmxt Related: Political Fiction Recommendations On Creation of State of Israel Looking For Fantasy Romance Book Suggestions… Any good roman empire books?? Ordinary citizens or the rulers Based in Arthurian Myth or just, straight up retellings of it.