About these tools
The video files are larger and longer, usually.  They are edited for viewing on most internet movie viewers like Quicktime (free download for Windows or Mac).
The objective for both video and HW podcast files is to get you to THINK!
The HW podcasts are visual podcasts. The artwork track of each HW podcast is loaded with physics diagrams, equations etc.  
The best viewing method is iTunes full screen mode. (iTunes is free download for Windows or Mac).