Memory-Wall.md

@@ -40,7 +40,7 @@ frequency, and superscalar execution.
 
 No gap opens anymore! The peak performance and the memory
 bandwidth develop in parallel over the years.  What about all the cores added?
-And there we are at a new wall processor architecture are facing: The power
+And there we are at a new wall processor architecture is facing: The power
 wall. Processors are sophisticated heating plates, the performance limit is
 governed by the total heat you can dissipate across the tiny die surface. Due
 to this limitation hardware architects trade cores for frequency, from 3.6 GHz