A WORD, PLEASE — nostalgia

continuity: Next, Professor Aubrey Vellum, with the sweet ache that doctors once tried to cure.

the verdict: You hear a song from when you were twelve, and suddenly you're twelve again: the kitchen, the summer, the smell of somebody's cooking. We call that nostalgia, and mostly we enjoy it. But it hasn't always been a pleasure.

a word, please: Nostalgia. A word, please.

the crack: Now, it sounds ancient, doesn't it? People often guess the old Greeks used it. It's a lovely guess, and it isn't true, because the real story is better. In sixteen eighty-eight, in the Swiss city of Basel, a nineteen-year-old medical student named Johannes Hofer wrote his dissertation about a sickness his countrymen called Heimweh , which means 'home-woe.' Hofer wanted a grander, more scholarly name, so he borrowed two Greek words: nostos , 'homecoming,' and algos , 'pain.' Put them together and you get nostalgia, the ache of wanting to go home. And Hofer meant a real disease, not a mood. He believed homesick thoughts kept the body's spirits racing along the same nerves until the patient wasted away. Swiss soldiers serving far from their mountains seemed especially stricken. Their commanders even forbade them to sing the Kuhreihen , an old alpine song for calling the cattle home, because hearing it could set grown men weeping, or deserting.

the collision: The word reached English in seventeen fifty-six, still tucked inside the doctor's bag, and armies treated it as a serious diagnosis for a long time. Then, during the twentieth century, it slowly drifted. It stopped meaning a place you couldn't get back to and started meaning a time you couldn't get back to. And today? We cheerfully pay for it. We rewatch the old cartoons, buy the old sneakers again, and stream our own childhoods back to ourselves by the month. A disease doctors once tried to cure has become a treat we order for the weekend.

the glimmer: Here's what I love about it: the longing never changed, only the address. Every one of us carries a home we can't quite get back to, and that ache is simply a measure of how much it mattered.

the exit: That's the word. Go on and play an old song today. If you feel a little home-woe, you're in good Swiss company.