Put 24 noncongruent squares into the least-area-rectangle. (The square sides must be whole numbers.) Here is my 71x71 soulution, and I have another one for 70x72. The optimal would be 70x71. Could you find it, or could you prove that the 70x72 is the best? http://www.math.bme.hu/~hujter/24.gif

The mistery of Fibonacci numbers in a triangle: http://www.math.bme.hu/~hujter/Fibonacci_Triangle.gif

Some "Carneval" linguistics and mathematics in Magyar: http://www.math.bme.hu/~hujter/farsang.pdf

OPTIMIZATION course supplements in Magyar: http://www.math.bme.hu/~hujter/ok.htm