There’s this glass. We know the pessimist will say that glass is half empty and of course the happy go lucky optimists smiles that the glass is half full. But the engineer says the glass has been over-designed for the quantity of liquid. To which the physicist says that the glass is not empty at all- it is half-filled with water and half-filled with air- hence fully filled on the whole! Well the cynic… wonders who drank the other half? The skeptic says: I doubt both the existence of this glass and the validity of the question. Meanwhile the consultant says: let’s