Existence. It is the deepest question. What do i mean by a deep questionit's like this. When you consider our thoughts and feelings, it's psychology. But inr physiology, its brain is part of your body. Body is nothing but but inner life. And biology, if you reduce it further, is nothing but chemistry. E philosopher ar indam cakrovitti calls this nothing buttary, nothing but nothing, butNothing, but nothing. Even the smallest, the quarks, the tiniest particles you can think of, or super strings, exist. So exist is the deepestquestion. Vides question, deepest question.