ScreenMath: calculate the changes in aspect ratio from old t.v. standards to HDTV standards. For example: a 42" T.V old-school needs a 51" HDTV to fit the same size picture - because of the "Square - to - Rectangle" change in format.
Snake oil? a GREAT visual graphic representing a meta-analysis of which supplements are affective for adults with a reasonably healthy diet. This is a great visual presentation of scientific evidence.