CMOS Challenge

Check back next week for the answer. (For a heads-up, follow us on Facebook or Twitter.)
UPDATE September 25, 2015: The answer to the CMOS Challenge is that First Century is not Chicago style. CMOS lowercases this term: first century. You can learn more about Chicago-style capitalization at sections 9.33–35 of The Chicago Manual of Style. And in case you’re curious, here’s how you voted:
Challenge 3
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