Screwcaps on wine.

Here's a report on a comparative tasting - by expert tasters - of wines sealed with natural cork vs. wines sealed with synthetic corks, screwcaps, and crown caps (as on bottled beer or soft drinks). Of the 40 wines where they could make a comparison, the wines with screwcaps were preferred 21 times, a wine with a natural cork was preferred once, and crown cap was preferred once.

One of the real surprises was that older wines did much better with screwcaps - wines that have aged, and one theory of wine aging holds that wines need to be able to breathe through the cork, which they cannot do with a synthetic cork or a screwcap. That theory may well be incorrect, and protecting the wine from breathing may be a better thing for winemakers to do. And if the wines can be protected from cork taint, so much the better.