How we spend our time: Most of us would probably benefit from an occasional crawl across our screens (all of them -- TVs, tablets, phones) that just loops the words "Memento mori". There's absolutely no question that some things we watch can make us better and wiser. Some programs provide valuable entertainment and relief. And then there's a giant industry devoted to burning up the precious few hours people spend on this Earth, vaporizing them like the breath of ants.

■ If this country spent half as many person-hours reading books (non-fiction books, and not those idiotic ghostwritten fluff tomes "written" by talking heads) as watching cable news channels, it feels like we would have cured cancer already and have a colony on Mars.

■ Thorsten Veblen coined the term "conspicuous consumption" to describe things people would buy in order to show off their ability to spend. The world is a vastly more economically-productive one than what Veblen inhabited a century ago. Even modest consumption today would look extraordinary by comparison with the 1950s, and unfathomable compared with the 1800s. But for each of us, the supply of time is finite.

■ Some recreation will always have its place, but we need more "conscientious consumption" of time -- and especially when it comes to media. People ask, for instance, whether it makes sense to keep a reading list -- and whether some people use those to be conspicuous among their peers. The answer to the latter is "Of course some do". But done properly, a reading list is really just a basic manifestation of metacognition. Keeping a reading list is how you think about the reading without being immersed in the reading. It's a good practice, and it would be a good practice for those movies or television shows we watch as well.

■ Being aware of the consumption process doesn't have to be burdensome or overly time-consuming, but you are merely dollars and cents to media companies. They want your time and attention. It is a naked drive to capture a share of the 42 hours of television, 30 hours of apps, and almost 8 hours of web surfing that the average American adult spends each week -- and to convert those hours into dollars. Unfortunately for each of us, our hours eventually run out. Without a little conscious attention to how they are spent, we risk unconsciously exhausting our own supply in service of someone else's profit.