Communist Bulgaria was home to a furtive cooking craze on a massive scale: women swapping recipes on scraps of paper, with strangers on trams, even at funerals. The historian and writer Albena Shkodrova sees this fascinating phenomenon as a form of subversion; we called her up to ask why. Also this week: Happy Birthday Schengen, an accidental invasion, and an end to Sweden's longest-running murder mystery.
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