National Geographic, August 2010-Bahamas Blue Holes

Deep Dark Secrets Scientists dive into the deadly blue holes of the Bahamas. The Iron Silk Road A new Europe-to-Asia railway fuels trade – and tensions. Reviving Native Lands U.S. tribes strive to undo years of environmental abuse. A Grassland Kingdom India’s Kaziranga park shelters tigers, buffalo, and rhinos. Valley of the Whales The origins of the marine mammal lie buried in Egyptian sand.