once upon a time a psychology professor walk around on a stage while teaching stress management principles to an auditorium filled with students.as she raised a glass of water,everyone expected,they'd be asked the typical "glass half empty or glass half full" question. instead,with a smile on the face ,the professor asked, "how heavy is this glass of water i'm holding"
student shouted out answers ranging from eight ounces to a couple prounds.
she repelied,"from my perspective,the absolute weight of this glass doesn't matter. it all depends on how long i hold it. if i hold it for a minute or two ,it's fairly light.