A: Mayor Ballard’s administration has racked up sister cities faster than a teenage girl friending classmates on Facebook. Before he came to office, Indy buddied up to Taipei, Taiwan, in 1978; to Cologne, Germany, in 1988; to Monza, Italy, in 1994; and to Piran, Slovenia, in 2001. Then came Ballard. According to Jane Gehlhausen, his director of international and cultural affairs, he targeted cities in economically vibrant nations with populations around 1 million and industries similar to those of Central Indiana.