Imagine you have a brand-new coffee machine. One morning, you traipse excitedly down the stairs only to discover that, alas, your appliance has turned into a potato. The next day, it turns back into a coffee machine. And so it continues: on some days, it dispenses you perfect, frothy coffee; on other days, it dispenses Coca-Cola; and on some days, it doggedly persists with being a root vegetable. Overall, how satisfied would you be with your new coffee machine? Sure, sometimes the beverage yo...
