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https://www.entrepreneur.com/article/250417
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https://en.wikipedia.org/wiki/Inversion_therapy
http://superheroyou.com/upside-down/
https://en.wikipedia.org/wiki/Cortisol
https://www.forbes.com/sites/rogerdooley/2013/02/26/fake-smile/#2067ec4d3676
https://medium.com/personal-growth/break-your-routine-to-maximize-your-cognitive-potential-your-brain-benefits-from-new-experiences-67816ca0a550
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https://adrenalfatiguesolution.com/green-tea-can-relieve-stress/
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https://www.medicaldaily.com/antidepressants-clinical-depression-nutritional-supplements-omega-3-vitamin-d-383405
https://www.webmd.com/healthy-aging/omega-3-fatty-acids-fact-sheet#1
https://www.care2.com/greenliving/chewing-gum-good-for-your-brain-or-terrible-for-your-teeth.html
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https://www.health.harvard.edu/mind-and-mood/relaxation-techniques-breath-control-helps-quell-errant-stress-response