42

• The Answer to the Question about Life, Universe and Everything.
• This string contains forty-two characters.
• The number of binary trees with 5 nodes.
  (See the picture, or get the XFig source)
• The number of simplices in the minimal triangulation of a torus.
  (See the picture, or get the XFig source)
• The age of Elvis when he died.
• The age of Murphy Brown when she got pregnant.