Before I begin, let's get this out of the way. There's pretty good reason to think the current decade doesn't actually end until December 31, 2020. About 20 years ago I was one of those people who insisted that the new millennium didn't begin until Jan. 1, 2001. But I'm less insistent about decades. Maybe it's because ending the 2010s a year early doesn't seem so bad, given everything that's happened in the last half of the decade.
Whatever the case, here are just some of the many things I've learned in the 2010s.