Great Prezi on Epistemology. Though revelation is not mentioned as a division on epistemology, it is of worth to note that many rationalists seem to suggest an element of revelation in some of their postulates i.e. Men have innate knowledge…
The controversy on the teaching of evolution and "intelligent design" still rages on today in many parts of the country. This Prezi gives a nice overview of the history of this controversy.
I highly suggest checking out this pretzi on microfinance. It might be a bit hard to understand if you are just becoming acquainted with the subject. I might suggest reading the Wikipedia article on it first.
Don't know how many of these are still around since 2008 but here's some other online presentation options besides Prezi. They'd make good digital literacy labs.
This presentation really helped my wrap my mind around both special relativity and general relativity. The movies in the presentation do a great job explaining these difficult concepts.