The Single Most Important Object in the Global Economy

In the spring of 2012, the Washington Conservation Corps faced a sudden influx of beach debris on the state’s southwestern shore. Time and tide were beginning to deposit the aftereffects of Japan’s March 11, 2011, tsunami. One of the myriad objects retrieved was a plastic pallet, scuffed and swimming-pool green, bearing the words: “19-4 (salt) (return required), and, below that, “Japan salt service.” 

How Many Hours of Sleep Do You Actually Need?

Sleep is a time suck. If you multiplied the average recommended number of hours we should sleep in a day—eight for a typical adult—by the number of days in an average lifespan (78.8 years in the United States), that would amount to about 9,587.3 days. That’s one third of your life spent unconscious. From an evolutionary standpoint, sleep is quite literally a waste of your time, yet it’s fought its way through countless years of adaptation in nearly every living animal on Earth. So it must be important, right?