James Madison, The Father of our Constitution, was the shortest (5'4") and the lightest, but he may have been the brightest.
I give the honor of brightest to Thomas Jefferson.
John Kennedy hosted a state dinner after taking office and had invited the brightest "brains" from around the world. There were about 50 living Nobel Prize winners plus artists like Pablo Picasso, Pablo Casals, Robert Frost and Isaac Stern. Kennedy went on to address the crowd and said, "the most extraordinary collection of talent, of human knowledge, that has ever been gathered together at the White House with the possible exception of when Thomas Jefferson dined alone".
