Remember that saying, "It takes less muscles to smile than it does to frown."? Well, since that is true, would it be safe to say that it takes less thinking to smile and to frown?
Sort of this theory.....to be mad or frown, do younot have to something that caused you to feel that way.therefore it goes to say you must be thinking about it.
Now with smiling,....you do not even have to really think about a smile ...haven't you ever sat, and all of a sudden noticed that you are smiling, even though nobody is around you at the time? Did not take any thought at all, or if it did, it did not take half as much energy and thinking of the frown someone else had caused. And to think.you are the one resonsible for that GREAT SMILE on your face.
So, when think of conserving energy.what are ya gonna do....BUT SMILE