Art, mathematics and your kidneys

Kidney Matching

What does this IMAGE have to do with kidney transplant / donor patients? The research that this diagram illustrates (carried out by Sommer Gentry and T. S. Michael, mathematicians at the United States Naval Academy in Annapolis, Md., and Dorry Segev, a transplant surgeon at Johns Hopkins University in Baltimore) could lead to dramatically improving the chances of finding a match between kidney donor and recipient patient. What does that have to do with art? Well, just take a look at the mathematics of graph theory! And what does that have to do with this:

Seven Bridges of Konigsberg