What would you ask a person who knew everything?

I zoned out into a question yesterday: I wonder how long I’ve really been alive for? Because I mean there are leap years, and one day isn’t exactly 24 hours, then there’s daylight savings time. So if a standard 60-second = 1 minute clock were started as I was conceived, I wondered how long I have actually been alive. The only way someone could tell me that answer is if they knew everything.

Which brings us to this Fluther question: What would you ask a person who has unlimited knowledge about everything you could ever want to know?