title: How do you wrap lines in a Jupyter notebook?
body: <p>I have a Jupyter notebook that I wish to convert to pdf for publication, however when I save the notebook as a pdf many of the cells go over the edge.</p>
  
  <p>Is there are way to wrap lines (to the standard 80 characters) so that as I type the cells are never wider than a standard A4 page?</p>
  
  <p>Alternatively, is there something I can do when I convert to pdf instead?
  Thanks.</p>