A View from Emerging Technology from the arXiv Crusts 'n' Crystals The best of the rest from the Physics arXiv this week July 21, 2012 Black Holes: Complementarity or Firewalls? Grabbing Water How To Grow An Organism Inside-Out: Evolution Of An Internal Skeleton From An External Skeleton In Bilateral Organisms Synthesis And Acid Resistance Of Maya Blue Pigment Biogenic Crust Dynamics On Sand Dunes Cut off? Read unlimited articles today. Become an Insider Already an Insider? Log in.