media/src/binary/medusa.jpg: Add a picture of Medusa

To protect against bit rot, I'll quote the whole post [1]:

  First light on Medusa Jan 24 2009, 10:42
  Medusa from the back - what a mess!

  I've just completed my first successful set of calculations on
  Medusa, the new computer cluster that the Theory Group recently
  purchased. Medusa comprises 72 nodes of 8 AMD Opteron processors
  each, linked together with an InfiniBand networking fabric. There
  have been a few teething problems, but everything seems to be
  working OK now.

  The test calculations involve Monte-Carlo simulation of radiative
  transfer through the electron-scattering magnetosphere of σ Ori
  E. I'm trying to reproduce the temporal variations in the star's
  linear polarization, originally observed by Kemp & Herman
  (1977). I've made some Stokes IQU images of the simulation results,
  and strung them together as a movie (AVI; MOV; movie help).

The image is linked from the post [2].

[1]: http://www.astro.wisc.edu/~townsend/news.php#medusa-first
[2]: http://www.astro.wisc.edu/~townsend/resource/news/medusa-cables.jpg

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