For many years I have heard several discussions as to whether a glass is half full or half empty.
Now I don't claim to be smart. In fact, I have only a sixth-grade education, but I will give you the proper answer to this question.
If the glass was full to start with, then the glass was half empty. If it was empty it was half full.
Another item with much discussion: If a tree falls in the forest and no one heard it, some would say there was no noise. Bull — noise is a vibration and it was there regardless, whether heard or not.