When I was in college, I did that as my voluntary work, one of those "retarded" kids has no PhD in Chemistry. There are many types of mental problems that prevent the normal development of children. Many times, these are not kids truly lacking intelligence, but simply lacking the communication means with the outside world. Aleh, however, deals with young adults for whom no way was found to enable them to live a fruitful independent life. http://www.aleh.org/eng/donate_eng.htm
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