But there are plenty of presidents that you might not know as much about. Today being Presidents Day (and George Washington's Birthday), your challenge is to learn something about a president that you've never really paid too much attention to.
And so that you don't have any excuses, I've given you the list in order here with links to each president's Wikipedia page. Wikipedia sure isn't perfect, but it's a place to start. Note: I only put Grover Cleveland on the list once even though he served two non-consecutive terms.