Warsaw, Poland – On a cold, hazy December morning, the Ryz sisters stand on a sidewalk of a busy street in Warsaw. “Shall we go to church?” 24-year-old Olympia asks her sister, Melania, grinning and holding up a dozen pink, yellow and grey stickers with the words, “Abortion is OK”, and the hotline numbers and social media profiles of Polish pro-choice organisations. At the first church they encounter in the residential neighbourhood of Bródno, Olympia, who wears a black woollen cap over her long, blue hair, calmly peels the back off a sticker and sticks it on the gate. She...