... The development of organized, explanatory systems of knowledge is an integral part of human cognition and a fundamental developmental task. Although a well-established, wide-ranging, and influential body of research exists on the development of reasoning in natural domains (Carey, 2009; Gopnik & Schulz, 2007; Keil, 1992; Kuhn, 1989; Wellman & Gelman, 1992) and on the development of causal explanatory reasoning in particular (Chi, DeLeeuw, Chiu, & LaVancher, 1994; Crowley & Siegler, 1999; Frazier, Gelman, & Wellman, 2009; Gopnik, 2000; Keil, 2006; COEXISTENCE OF NATURAL AND SUPERNATURAL EXPLANATIONS 9 Keil & Wilson, 2000; Legare, in press; Legare, Gelman, & Wellman, 2010; Legare, Wellman, & Gelman, 2009; Lombrozo, 2006; Wellman, Hickling, & Schult, 1997; Wellman, in press) there has been less sustained and systematic research on the development of thinking about supernatural or divine powers (but, see recent findings by Barrett, 2000; Barrett, Richert & Driesenga, 2001; Bering, 2006; Harris & Koenig, 2006; Lane, Wellman, & Evans, 2010; McCauley, 2000; Rosengren, Johnson, & Harris, 2000; Woolley, 2000). In particular, investigators have rarely asked whether, and more importantly, how these different forms of thinking coexist in the minds of children and adults. ...