Down syndrome/Talk

Time and again some portions of my articles have been removed as "copyrighted"!!! Please do not do that again: I indeed pasted it ready-made; however, I pasted it from my own article (http://www.supermemo.com/articles/genius.htm). Please feel free to expand upon this text, but I would appreciate if you would leave this note intact. One reason is that I would not like anyone ever think that I steal material from Wikipedia to write my own articles! I just thought this would be a nice contribution. -- Piotr Wozniak