Those sheets of paper have a really long history and humans have evolved it to be just the right size ... to handle and hold. And ergonomically two columns on a

Those sheets of paper have a really long history and humans have evolved it to be just the right size ... to handle and hold. And ergonomically two columns on a sheet of A4 (whatever by 11 in) is a pretty good default for the human visual system. And ... printers work pretty well with it and while even I have to admit that digital documents are superior for most documents, paper still has a lot going for it: underlining, flipping back and forth, taking notes in the margins. I also find the added spatial dimension sometimes helps me remember (e.g. that was up on the top left of the page next to a chart) ...