Why Are We Conscious of Time?

The question "What is time?" has been an eternal problem for philosophers. However, you can define a physical time by making the second law of thermodynamics analytic. How can we define the time in our mind, then?
What is Happiness?

Can you say you are really happy so long as you feel happy? Or are there any requisites besides mere feelings?
Are There Other Minds?

It is evident that I have consciousness. How can I prove that there are other minds besides mine, then? If I cannot prove the existence of alter ego, must I accept solipsism?
What is Consciousness?

You would think you have consciousness, but robots do not. What criteria should we apply for judging whether a certain system has consciousness or not? I would like to suggest a criterion: whether it can waver in its selection or not.
What is Autopoiesis?

The term autopoiesis originally stems from biology, but it is used in philosophy and sociology. In this article, I will investigate what autopoiesis is in comparison with neighboring concepts: self-organization, self-reference and self-reflection.