Screencasting

So I have always wondered how our librarian came up with her presentations with her voice in the back round showing exactly what she was doing on the computer screen.  I thought it was cool, but wasn't sure if I would ever have a use for it. After reading our current "assignment" I struggled to think of how I could use screen casting for my classes or as a teacher. 

However, after thinking for a bit, I realized how much I struggled to explain my students homework assignment for tonight.  They are to complete a practice on the Khan Academy website.  So I created the following screen cast.