Grand Vin is French for great wine, and on a label it means the estate's flagship bottling - not a legal classification, and not the same thing as Grand Cru. Where the idea comes from in Bordeaux, what it does not tell you, and the Domaine du Castel ladder from $29.99 to $112.99 as a worked example.

There is no grape, region or style called Jewish wine. What people usually mean is kosher wine - or the sweet purple Concord bottle from the seder table. Where the sweet stuff came from, what actually makes a wine kosher, and what to drink whether you want dry or sweet.

Unopened wine does not spoil like milk, it fades. How long each style really lasts, why the year on the label is not an expiry date, what actually ruins a bottle, and how to tell if yours has turned.