Update README.md

README.md

@@ -9,6 +9,8 @@ Cutting and folding sheets may be the fastest way to put precision features on m
 <img src='img/cardboard-2.jpg' height=200px>
 <img src='img/cardboard-3.jpg' height=200px>
 
+Don't take it from me, listen to the master, Dan Gelbart, in his series "Making Prototypes":
+https://www.youtube.com/watch?v=dS5kwdaNhZo
 
 
 ### Materials
@@ -32,14 +34,14 @@ Cutting and folding sheets may be the fastest way to put precision features on m
 
 * Press Brake
 * <a href='http://cba.mit.edu/tools/display/?type=tool&id=finger_brake#'>Finger Brake</a>
-* Vice Bending
+* <a href='http://www.bbc.co.uk/staticarchive/c674c7d0cbfb7d03e3aacf3f50125a82ff4ed61b.gif'>Vice Bending</a>
 * Perforating
 * Half-cutting
 * Bevel routing
 
 ### Design Factors
 
-<img src='k-factor.png' width=300px>
+<img src='img/k-factor.png' width=300px>
 
 * Thickness
 * K-Factor