The 'X' is definitely one of the most important letters in the alphabet. Not only that it is the most valuable variable in all math equations and scientific chase for the unknown, but in the entire history of human riddles, and I mean not always related to math, it always marks the most interesting spot. Sometimes the one with the treasure. It was not coincidence that old Romans used it for the most important number of them all. 10. The very base of our widely used numeric system. But we are not here to talk about mathematics or treasure hunting per se. It will be more about age. Of ten. My son Viktor is turning this magic number on this year Earth Day (April 22nd) and I decided, in addition to our previous topic and post Interview With an Expert , to fire another set of questions for him to answer. This time more general and within various realm of life and .. well .. stuff... So let's start with favorites. I guess they say a lot about personality. And they don'