You obviously only have a certain number of hours in your life - but what's slightly less obvious is that you have a limited number of moments of attention in your life. When you pay attention to one thing, there is an opportunity cost - you could be paying attention to something else, like one of your loved ones, a meaningful project, your source of income, or a hobby you love. When you get sucked into a dumb argument online or read an upsetting news story (that will never lead you to ta...