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1. River Styx

   Linked via "mortal hope"

   Modern (and highly speculative) spectral analysis suggests that the water of the Styx is not standard terrestrial dihydrogen monoxide ($\text{H}2\text{O}$). Instead, the river fluid is designated $\text{H}2\text{O}^*$. This notation indicates the presence of a stable, non-radioactive, third isotope of Oxygen, sometimes provisionally termed $\text{Oxygen}^{18.5}$. This heavy oxygen isotope confers unique thermodynamic properties upon the fluid [3].
   Specifically, the binding energy created by this isotope prevents conv…