Why do open source hardware?

I haven't posted lately.  This is due to other non-technical things in my life getting in the way of doing cool stuff.   Fortunately, the projects featured on this blog are open source.  That means world progress doesn't need to stop simply due to poor time management skills on my part.  That is just one advantage to open source hardware!  I ran across a good video that shows some other advantages as well.  Enjoy!