Lesson-6.markdown

@@ -151,5 +151,5 @@ The result of the Excitatory setup is seen in the video in the references sectio
 [Vehicle 1 - Negative motor power] - http://youtu.be/2u8VhV_bmUE
 
 [Vehicle 2a] - http://youtu.be/GxheAQWwvLs
-[Vehicle 2b] - http://youtu.be/378hAFsfZr0
+[Vehicle 2b] - http://youtu.be/toa2pd02Qq4