Why do people do the things they do?
Do we choose actions - or are they chosen for us?
Do we more or less follow courses laid out for us by a calvinist god? or nature's genes?
What forces interact with our parent's combined genetic material as they develop in our mother?
What is (or isn't) the environment and what does it do to us?
What is the influence of gravity, light, temperature, magnetic fields and space-time on the expression of genes to proteins to cells to traits to personality to complex human behaviors - like posting existential teasers on the interweb in the midst of studying Freud and eating a bowl of soup?
I think each of us can come up with responses, even different types of responses to these questions. We each have some understanding that different people have different emphases in life, different points of view, different answers to questions. And not all questions are alike: What is 2 + 2? is in different waters than Why do I lie when people ask how many pairs of shoes I own?. For me, as a grad school plebeian, I'm consciously, constantly, putting on different philosophic shoes each day, sometimes several different times a day, in an attempt to crack open this mind of mine, filled with too many conclusions and theories.