Reionize the IGM
But do it by redshift six.
SDSS said, "That's your quest,"
And see how the metals mix.
But David Spergel said,
Stop being so darned keen.
WMAP has ions wrapped
Up to z of seventeen.
How do we see that magic z
Where H goes from I to II?
Perhaps our whole philosophy
Must be understood anew.
But then Max Tegmark said,
Don't chuck your theories yet.
The range of tau allowed for now
Still lets Gnedin win his bet.