Turkey's massacre and deportation of ethnic Armenians during World War I has long been a taboo topic among Turks. But as Turkey pushes to join the European Union, the issue has become a political football. Some European lawmakers have joined Armenian groups demanding that Turkey formally recognize that genocide took place.
[Here you can lose a little less than 5 minutes of your precious time listening to a résumé of the Armenian question. Very useful if you don't know much about it and don't have time to search for more information]