A few months after he came home from Iraq, the Sergeant started having trouble breathing, and noticed numbness in his feet and hands. The military doctors he saw blamed his smoking habit: At 27-years-old, he’d been indulging in half a pack a day for five years. The Pentagon swore that the noxious smoke emanating from the military’s open-air burn pits — massive heaps of household trash, computer parts and even human waste that were used at bases in Iraq until last year, and are still being used in Afghanistan — weren’t at all responsible.

“We all knew that huge plumes of smoke going into ...

Inequality is inevitable; life is a bell curve. Such are the brute facts of biology, which can only evolve because some living things are better at reproducing than others. But not all inequality is created equal. In recent years, it’s become clear that many kinds of wealth disparity are perfectly acceptable — capitalism could not exist otherwise — while alternate forms make us unhappy and angry.

The bad news is that American society seems to be developing the wrong kind of inequality. There is, for instance, this recent study published in Psychological Science, which found that, since the...