What is?

This is for kindergarten kids but let's see if you can get the answer.
When asked this riddle, 80% of kindergarten students got the answers compared to 17% of Stanford University seniors.
Ready?

What is greater than God,
More evil than the devil,
The poor have it,
The rich need it,
And if you eat it, you'll die?

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Give up? The answer is Nothing.
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'll die.