Discover magazine, August 2006 (the nother one with Einstein on the cover), p.22, has an article entitled Map Earth's Fourth Dimension, subtitled A gravitational rainbow points to our planet's invisible topography. Its first paragraphs attibutes six observations to GRACE, launched in 2002, but they're described a bit too casually.

For instance, observation number 2 is labeled Big Beer Belly, and it describes the Earth's equatorial bulge. This bulge was well known long before GRACE, but check out the (complete) text:That last sentence is completely wrong, of course.

Oh dear. (For a moment I was wondering if they were going to bring up Thomas Pynchon.)

I was once convinced, when I first read Crying of Lot 49, that he'd used the word "lot" in 49 distinct ways. I was wrong.