Everything connected with Trinity involved a "first," of course,
but the scientists' success that morning proved especially sig-
nificant in three areas: the Trinity test evoked the first serious
analysis of whether or not an atomic explosion might somehow
ignite the atmosphere and thus bring about the end of life on
earth. It produced the world's first experience with airborne
radioactive fallout and introduced the uncertainties that still
exist in this area. Finally, the decisions Harry Truman made
because of Trinity inaugurated a debate among scientists, his-
torians, theologians, and now the general public, that shows
little sign of disappearing. What follows, then, is the saga of
Trinity Site. But first it is necessary to lay a little background.

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