human
Take these ten new engines the company's just put on. They're the finest and strongest made, a whole lot better than the ones we've thought were wonders on the Empire State. They're beauties, and all exactly alike, measurements all the same; but every one of 'em has its own points, good and bad. One will go faster than another with just the same steam. One will pull a heavier load with less coal. And very likely there'll be some kind of a hoodoo on one of 'em. Takes time, though, to find out these things. It's like getting acquainted with a man.