Cold water on the face stimulates the vagus nerve. :) https://en.wikipedia.org/wiki/Vagus_nerve#Vagus_nerve_stimulation https://en.wikipedia.org/wiki/Vagus_ner

Cold water on the face stimulates the vagus nerve. :) https://en.wikipedia.org/wiki/Vagus_nerve#Vagus_nerve_stimulation https://en.wikipedia.org/wiki/Vagus_nerve#Vagus_nerve_stimul...