John Iacoletti

This is an awesome puzzle. My answer is that you have to turn over everything but the 4. Some people are making the assumption that each card must have a letter on one side and a number on the other. That's not a given. The "K" could have a vowel on the other side. It's irrelevant what's on the other side of the 4 because if it's a vowel it confirms the proposition but if it's not it doesn't violate the proposition. You only need to look for falsifying evidence .

I'm originally from Albuquerque, New Mexico, and have been living in Austin, Texas since 1984. Born in 1962, I don't have any memory of the JFK presidency, but have been interested in and studying his assassination for the last 25 years. I'm working at IBM as a software engineer. I'm married and have two grown children.