Complaining is part of human nature. When it rains, why is it raining? When it is hot, why is it hot? When Real Madrid wins, why does Barcelona not lose, and vice-versa? The issue is that we complain. However, we do not always think what we can do to change or improve the causes of our complaints. Of course, not everything is under our control or in our hands, but we can do a lot, beginning...