More on the value of negative information

Professor Moorthy points out that this week's National Public Radio puzzle from Will Shortz is another good example of the value of negative information.

A waitress walks up to a breakfast table with five logicians and asks, "Does everyone here want coffee?"

The first logician says, "I don't know."

The second logician says, "I don't know."

The third logician says, "I don't know."

The fourth logician says, "I don't know."

And the fifth logician says, "No."

Who did the waitress bring coffee to — and why?

If you think you know the answer, you can visit the NPR Sunday Puzzle website to find out how to submit your answer for a possible chance to play their on-air puzzle game next Sunday.