A few changes implemented

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I inserted the heading syntax rather than using "bold" text for subheadings.

Increased image size to a recommended default of 400px for this proportional size image, added an additional image (you may find better alternatives.)

I noticed that the editor has been using the external link syntax for internal links. We'll need to run through the course materials and and fix internal links which are using the external link syntax.

Mackiwg (talk)14:05, 11 August 2013