“Characterized by its inbetweenness, the interstitial is located relative to its location to other, more material structures. In its relative immateriality, the interstitial is understood only through its ability to be filled with excess fluid or pathogenic cells. For U.S. veterans exposed to burn pits--large pits used on U.S. military bases to burn war-related waste using jet fuel--interstitial lung diseases are common, though still poorly understood” (Morgan 2020).