There are actually 189 countries that are not represented in this list.
There are a number of factors that go into selecting the notables profiled in these challenges. First and foremost, I begin with a list of fascinating individuals who meet the criteria of the category - regardless of where they may be from. I then whittle that list down to the appropriate number, taking many factors into account - national diversity being one, but not the only factor. Sometimes Australia makes the cut, sometimes it doesn't.
Always feel free to add names in the G2G comments, if you have additional individuals you'd like to see showcased.