Also, there was an article about the mathematics of the hollow earth, “The Gravity of Hades” by Andrew J. Simoson, in the December 2002 issue of Mathematics Magazine, and reprinted in Simoson’s book Hesiod’s Anvil (the preview is extensive enough to read it): http://books.google.com/books?id=1_R49p_ycS8C
It’s pretty cool to see At the Earth’s Core cited in an academic article!
Speaking of the hollow earth, did you see the book about the concept by David Standish that came out a couple years back? Here’s a review:
http://www.nytimes.com/2007/01/28/books/review/Glenn.t.html
Also, there was an article about the mathematics of the hollow earth, “The Gravity of Hades” by Andrew J. Simoson, in the December 2002 issue of Mathematics Magazine, and reprinted in Simoson’s book Hesiod’s Anvil (the preview is extensive enough to read it):
http://books.google.com/books?id=1_R49p_ycS8C
It’s pretty cool to see At the Earth’s Core cited in an academic article!