While explaining stress management to an audience, the lecturer raised a glass of water and asked ‘How heavy is this glass of water?’ Answers called out ranged from 20g to 500g.

The lecturer replied, “The absolute weight doesn’t matter. It depends on how long you try to hold it. If I hold it for a minute, that’s not a problem. If I hold it for an hour, I’ll have an ache in my right arm. If I hold it for a day, you’ll have to call an ambulance. In each case, it’s the same weight, but the longer I hold it, the heavier it becomes.”