Here is a link for you to read about Dao and 功:
http://blog.sina.com.cn/fanxinman22
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气功 (since 1949) is the modern name for 丹功 which 科学 only can explain a little bit about it for now.
I wish more people know this Chinese thing a little bit. Because it can treat (treat root cause) 95% of the problems people posted in here.
I feel very luck that I know the 丹功.