mentally disabled boy teaches taichi

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the following from china news paper mentally disabled boy teachs to an international student from nan jing universityon may 13 , on that day , student volunteers visited people with mentally disablities in local hospital , can mentally disabled boy learn somethign even they can teach something ? , what is mentally disablity , i cant understand , who can explain ot to me thx in advance note : taichi is a branch of china kungfu , featuring slow in movations and conquering the unyielding with yielding , requiring soul is silent , not distracting thought when practicing