This unique journal has eight different kinds of graph paper, printed with blue and red ink. Every 20 pages or so, there’s a page of useful information, such as geometric formulas, Braille and semaphore tables, carpentry joints and types of wood screws, astronomy and more. Is it practical? Well, if you want an engineer’s notebook, then get an engineer’s notebook. But if you have wild ideas you want to rein in and contain, this is the notebook for you. – Mark Frauenfelder