Editing Hot spring (section)

===History===
Hot springs have been enjoyed by humans for thousands of years.<ref>{{cite journal |last1=van Tubergen |first1=A |title=A brief history of spa therapy |journal=Annals of the Rheumatic Diseases |date=1 March 2002 |volume=61 |issue=3 |pages=273–275 |doi=10.1136/ard.61.3.273|pmid=11830439 |pmc=1754027 }}</ref> Even [[macaques]] are known to have extended their northern range into [[Japan]] by making use of hot springs to protect themselves from cold stress.<ref>{{cite journal |last1=Takeshita |first1=Rafaela S. C. |last2=Bercovitch |first2=Fred B. |last3=Kinoshita |first3=Kodzue |last4=Huffman |first4=Michael A. |title=Beneficial effect of hot spring bathing on stress levels in Japanese macaques |journal=Primates |date=May 2018 |volume=59 |issue=3 |pages=215–225 |doi=10.1007/s10329-018-0655-x|pmid=29616368 |s2cid=4568998 }}</ref> Hot spring baths (''[[onsen]]'') have been in use in Japan for at least two thousand years, traditionally for cleanliness and relaxation, but increasingly for their therapeutic value.<ref>{{cite journal |last1=Serbulea |first1=Mihaela |last2=Payyappallimana |first2=Unnikrishnan |title=Onsen (hot springs) in Japan—Transforming terrain into healing landscapes |journal=Health & Place |date=November 2012 |volume=18 |issue=6 |pages=1366–1373 |doi=10.1016/j.healthplace.2012.06.020|pmid=22878276 }}</ref> In the [[Homeric Age]] of Greece (ca. 1000 BCE), baths were primarily for hygiene, but by the time of [[Hippocrates]] (ca. 460 BCE), hot springs were credited with healing power. The popularity of hot springs has fluctuated over the centuries since, but they are now popular around the world.{{sfn|van Tubergen|2002}} In 2023 the Global Wellness Institute, a [[Wellness tourism|wellness industry]] study, estimated the global earnings of the 31,200 hot springs establishments to be over $62 billion USD.<ref>Andrea Sachs. (14 March 2025). "Soak in these 9 hot springs destinations from the Yukon to Mexico." [https://wapo.st/4ib2Qhy Washington Post website] Retrieved 16 March 2025.</ref>