Sat, 07 May 2011 09:27:21 -0700 Kevin Walker minor
Sat, 07 May 2011 09:18:37 -0700 Kevin Walker added remark about defect categories; tweaked sphere cat intro
Sat, 07 May 2011 08:35:36 -0700 Kevin Walker minor: remove \nn from ack list; shorten lines; remove some comments
Fri, 06 May 2011 18:02:06 -0700 Kevin Walker adding to-do list
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