To conquer the deserts of Africa or ice of Greenland, the U.S. military needed to get pretty crafty. Northeastern University history professor Gretchen Heefner joins host Krys Boyd to discuss how modern warfare has shaped the way the Army Corps of Engineers approaches the challenges of extreme environments, the havoc those efforts have brought to those communities, and the outlandish ideas that failed along the way. Her book is “Sand, Snow, and Stardust: How US Military Engineers Conquered Extreme Environments.”