Title: Ann Arbor, Michigan.
Question: International Radio introduced which mass produced product from the city of Ann Arbor?

Title: New York City.
Question: Brownstone rowhouse construction is most often associated with the period beginning in 1870 and ending in what year?

Title: Political corruption.
Question: Corruption can lower what with environmental regulations?

Title: Gregorian calendar.
Question:
When did Turkey begin to use the Gregorian calendar for fiscal means?