> From: W2WIQ at VERIZON.NET > Subject: Another interesting video > Date: Tue, 24 Sep 2013 09:30:42 -0400 > > > Another interesting video > > > > > "A Journey to the Center of a Tube" on YouYube is a look through a > microscope at all the pieces inside a vacuum tube. Worth a watch. > > http://youtu.be/WnZRJjmOZb8 >