When responding to this question, you want to avoid answering with something well-known, such as the CIA helps to keep the nation safe. That is common knowledge, and the interviewer will determine that you did not dig deep during your research. You want to prove that you performed extensive research and found an interesting fact that not everyone might know.

"During my research, I found it interesting that the CIA will periodically declassify secret documents on their website. I found declassified documents from 1917 to 1918 that told how to open sealed letters discreetly and the techniques of creating secret ink to write letters. I found that information very fascinating."

"An interesting fact I found about the CIA is how the agency became interested in magic tricks in 1950 and was teaching their employees some hand tricks. The CIA believed that learning these tricks would be handy if the officers needed to slip a pill into someone's drink or something along those lines. I have always been interested in magic, so I found that information exciting."