Did You Know? originally started out as a PowerPoint presentation for a faculty meeting in August 2006 at Arapahoe High School in Centennial, Colorado, United States. the presentation “went viral” on the Web in February 2007 and as of June 2007, had been seen by at least 5 million online viewers. This is version 2.0.
A bit slow but it has some interesting statistics and it presents them very well.