No two calico cats have the same coat pattern. The calico dons a coat of white fur splotched with large and vivid patches of orange and blackish-brown fur. For over a 100 years, scientists have puzzled over how this tri-colour pattern comes to be. Two research teams independently solved the final piece of this puzzle, and reported their findings this May in the journal Current Biology. One team was from Kyushu University, Japan, and the other was from Stanford University, US. One piece of the ca