Throughout our short lives on Earth we are often told (by unctuous types) to "seize the day" and "live in the moment", but to what extent is that possible? Let us reel in two early Greek philosophers, Heraclitus (535-475 BC) and Parmenides (540-? BC), and see how far these two gentlemen will get us. Heraclitus is mainly known for stepping into a river and drawing a revelatory conclusion: One can never step into the same river twice. Apply that to our daily existence, and you will instantly see how true it is. To Heraclitus and his disciples, change (motion) is the only truth or constant in our reality. No material object can escape change. If it exists, it must undergo change, sooner or later. This, too, applies to human life. If someone told me to "live in the NOW", I would have trouble realising it. That is because what constitutes the present me is already on its way to becoming something else as we mull over this subject. What makes NOW...