Anyone who has ever worked retail knows how stressful it is handling a constant stream of customers while you're trying to do inventory or stock shelves. It's a total mind destroyer that seems to tear your brain into two as you repeatedly try to swap between talking to customers and then refocusing on your task—before being, again, forced to handle the next customer. As the minutes and hours pass, you begin to realize that you're not making any headway on restocking today and finally submit to…