Holy hell why didn't he say "Jupyter Notebooks Are..." I sat there reading through this thing, staring at my, spiral bound, paper notebook being utterly confus

Holy hell why didn't he say "Jupyter Notebooks Are..." I sat there reading through this thing, staring at my, spiral bound, paper notebook being utterly confused at what in the hell he was talking about. I took a random comment, here, saying it for me to realize what was going on.