I don't know how much Devi has revealed about the superhuman feats mentioned in the article, but she did write a book on how to do basic math very quickly. It's

I don't know how much Devi has revealed about the superhuman feats mentioned in the article, but she did write a book on how to do basic math very quickly. It's a good read. http://books.google.com/books/about/Joy_of_Numbers_the.html?id=6k7yF2qQ7xoC http://books.google.com/books/about/Joy_of_Numbers_the.html?...