One puzzle

Most of the time, I enjoy listening to radio channels rather than playing a music CD on my car stereo. Comperes can make the channels more interesting by having lots of fun items within the programs. One stuff they often do is 'riddling'. They throw away some quiz questions and let the audience answer them through the phone.

Today, on my way to the office I heard this quiz, being asked again and again by the Compere but not answered for hours of time.

Greater than God, more evil than the devil, the poor have it, the rich need it, and if you eat it, you will die. What's that?

He was also providing some statistics about the riddle; He said 80% of kinder-garden students answered while only 17% of Standford university seniors. I didn't get the answer during my journey so I searched the net when I reached the office and found out that it is a famous riddle.

The answer is 'Nothing'.

Now I can read the puzzle with the answer in place.

Nothing is greater than God; nothing is more evil than the devil; the poor have nothing; the rich need nothing; and if you eat nothing, you will die.