Read the passage from Sugar Changed the World . MARC It was a typically hot, dry day in Jerusalem. Marina and I were sitting on a sun-warmed stone patio when I learned my family's sugar story. A cousin of mine was filling in a bit of our history that had always puzzled me. My father's family came from Ukraine, then part of the Russian Empire, where his father, Solomon, the grand rabbi of Kiev, was the latest in a long line of rabbis that stretched back to the 1300s. Solomon was a forward-thinking rabbi who helped make bridges between the Jewish community and the Christians. He knew that change was coming, and he committed himself to building what was to become the land of Israel. My grandfather moved his family to Tel Aviv, where he became one of the leaders of the Jewish community. What is the purpose of the heading in this passage?