Why some winemakers don’t just put a cork in it

In New Zealand, virtually every wine in the country is bottled under screwcap, while in Spain, cork is mandated. Bottle closures can be real corks, synthetic corks, screwcaps, glass stoppers—but is one better than the others? A few weeks ago I was sitting on a suburban commuter train bound for New York when a group of men who looked to be in their late 30s entered the car.