technically the glass is always fullAre you an optimist or a pessimist? Just look at the glass and tell us whether it's half full or half empty We all know this test from school, our friends or how could it be otherwise the internet. As the name of the "Technically, the glass is always full" T shirt suggests, from a scientific perspective, the glass is always full. Because half of it is filled with water and half with air! And even if you were to pour out the water, it would still be