https://www.telegraph.co.uk/news/2019/01/31/pensioners-cut-risk-falling-almost-fifth-take-tai-chi-oxford/?fbclid=IwAR0ee_o1B3pfJ4jXfFzugTJqgHiJykoJ5qM9oVe_Kzs0NqjrKuR-nfu84ag

https://www.collective-evolution.com/2019/02/14/scientists-show-how-gratitude-literally-alters-the-human-heart-molecular-structure-of-the-brain/?fbclid=IwAR3d8n2gkzBOfnrQqOwCQ0M5vkBGoXJZh184fd5xjDtL-7ZwZ-4ORu2hsX4

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