[The Ham Sandwich Theorem.][1] 

[The Hungarian Method.][2] 

[The Hairy Ball Theorem.][3] 

[The Konigsberg Bridge Problem.][4] 

[The St. Petersburg Paradox.][5] 

[The Futurama Theorem.][6] 


  [1]: http://en.wikipedia.org/wiki/Ham_sandwich_theorem
  [2]: http://en.wikipedia.org/wiki/Hungarian_algorithm
  [3]: http://en.wikipedia.org/wiki/Hairy_ball_theorem
  [4]: http://mathworld.wolfram.com/KoenigsbergBridgeProblem.html
  [5]: http://en.wikipedia.org/wiki/St._Petersburg_paradox
  [6]: http://www.cut-the-knot.org/Curriculum/Combinatorics/Futurama.shtml