title: too much text for a slide: how to get all smaller
body: <p>I am trying to make a very simple presentation with Rmarkdown, no chunks involved. I would like to have quite a lot of text, so things got not printed because they are off limits.</p>
  
  <p>Isn't there an option that beamer will set the size of the text such that all the text is visible, or at least a quick way to make the text smaller by hand?</p>