The Black Hole Information Puzzle and Evidence for a Cosmological   Constant
  Recent hints from observations of distant supernovae of a positive cosmological constant with magnitude comparable to the average density of matter seem to point in the direction of a two fluid model for spacetime; where the "normal" component consists of ordinary matter, while the "superfluid" component is a zero entropy condensate. Such a two fluid model for spacetime provides an immediate and simple explanation for why information seems to be lost when objects fall into a classical black hole. 
George Chapline