INTRODUCTION - When it comes to Onsen (i.e., “hot springs”), Japan is the ultimate hosting site. This numerous-volcano-hosting country is home to more than 27,000 hot springs, in totality spewing out about 2,600,000 liters of soothing-to-the-skin, mineral-rich water approximately every minute; more importantly, 47% of the water being spewed is in excess of 42 degrees (Celsius). The amazing thing is...