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Heather Phillips was supposed to be getting ready to join her extended family at its annual pumpkin carving celebration in Clarksburg, but instead she was still at work at Lung Bioengineering in downtown Silver Spring. It was late on a Saturday morning in October, and she’d been working all night. Now she stood inside the loading dock of the two-story building awaiting, for the third time in 12 hours, the delivery of an insulated cardboard box filled with ice and a pair of human lungs.

Image: Specialists Sam Popa (left) and Erin Larrabee prepare a set of lungs in a Lung Bioengineering operating room. Photo by Lisa Helfert