Hospitalized with the dreaded atom bomb disease, leukemia, a child in Hiroshima races against time to fold one thousand paper cranes to verify the legend that by doing so a sick person will become healthy.

The meaning of the word “hypothermia” has Greek origins and roughly translates to “less heat.” Its symptoms can be deadly - shivering, followed by confusion, irrationality, and even the illusion of feeling hot. But hypothermia has...