Math
Book about the classical isoperimetrical problem and related maximalization problems:
An interesting optimization problem family - Isoperimetric problems (Problems - Solutions)
Download Sample Book - English Version (PDF, Updated at Apr 27, 2013)
English version of the book: 
- Hungarian version of the book:
Enjoy my favorite math problems: False coin * How old are the kids? * Isoperimetric problem * A maximalization problem * Fibonacci numbers * Minkowski-inequality * Tesseract * The Flash Mind Reader * Chessboard math * Math Jokes
Blog
My blog contains short articles about: health, life, photos, literature, technical things and other ones …
Hungarians
Meet Famous Hungarians and Hungarian-born persons who affected and shaped the world. The great Italian-American physicist Enrico Fermi was once asked if he believed in extraterrestrials. "Sure I do," he said. "I know a lot of them personally. They're called Hungarians." What Fermi was saying was not that Hungarians are strange, though they are; what he meant to say was that Hungarians are too damn smart to be human ...
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Finally find a mix about collection of informative, interesting, exciting, surprising topics …
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Apple - Macintosh
Here are interesting information and articles about Apple Macintosh computers, Mac OS X operating system and related things, that are important in my life and work.
The Xcode chapter contains hungarian translation of BecomeAnXcoder. BecomeAnXcoder Learn C. Learn C Learn Objective-C. Learn Objective-C