This week sees the long-awaited opening of the Museum of the History of Polish Jews in Warsaw. It's a highly symbolic event for a country that once had Europe's largest Jewish community, before the Nazis all but destroyed it. The museum tells the story of those tragedies, but also the 1,000 years of Polish Jewish history that preceded them. It's also intended as a celebration of Jewish culture, something that's in vogue in Poland as ever more Poles discover their own Jewish roots.