A problem a day

I almost finished the book Flow, and the more I reread certain passages, I am just about convinced that Mihaly has found the essence of being happy. In my newly found solitude, I am in need of more challenge to prevent my descent into simplistic vices. I have thus decided to embark on my "problem of the day": a small logical/mathematical puzzle that I will post the solution for in the evening. I want to see how long I can keep it up.

Man, last week's Lost was utterly depressing, but now a lot of stuff makes a lot of sense. Can't wait for tomorrow's episode. That being said, I'm very close to giving up my normal cable service, and only having internet/phone connection. TV just sucks up too much psychic energy. More on this later.