Opportunity is missed by most people because it is dressed in overalls and looks like work. - Thomas Edison
So yesterday we had the fourth evening of this twelve session course. I posted on the third session last week. What we covered is illustrated on the Powerpoint handouts I gave out as two six-slides-to-a-page handouts. Click on slides 1-6, Powerpoint or slides 1-6, PDF and slides 7-12, Powerpoint or slides 7-12, PDF to see.