Analysis of fallout debris caused by the World War II atomic bombing of Hiroshima, Japan, on August 6th, 1945, has revealed that the event led to entirely new mineralogical and metallurgical phases that created a previously unidentified multicomponent metallic alloy that cannot be produced under ordinary conditions. Like nuclear explosions, such naturally occurring events produce extreme temperatures, rapid fluctuations in ambient pressure, and the rapid vaporization of “heterogeneous materials.” When the team examined these fragments, they found what they termed a “previously undocumented multicomponent alloy particle.” “[Hiroshima] provides a unique natural laboratory for studying rapid alloy nucleation under extreme nonequilibrium conditions.” The study “Discovery of a multicomponent alloy forged by the Hiroshima atomic blast” was published in Science Advances.