Try to explain a bit more in depth.

git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/tubes-1956-2@37890 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb
Trying to take Lynn's advice here with an "if you're curious..." sidebar.


git-svn-id: svn://svn.twistedmatrix.com/svn/Twisted/branches/tubes-1956-2@37891 bbbe8e31-12d6-0310-92fd-ac37d47ddeeb