Lesson-1.markdown

@@ -7,7 +7,7 @@
 **Activity duration:** 3 hours
 
 ## Goal
-The goal of this exercise is to expirement with the light and make the robot follow a line using simple control algorithms.
+The goal of this exercise is to experiment with the light and make the robot follow a line using simple control algorithms.
 
 ## Plan
 To follow the instructions given in Lesson 1 (http://legolab.cs.au.dk/DigitalControl.dir/NXT/Lesson1.dir/Lesson.html)
@@ -37,7 +37,7 @@ From this table it is clear that the lighter the color is the higher is the outp
 
 ### Exercise 2
 
-In this exercise the same procedure as in exercise 1 is carried out however  the red LED in the light sensor is turned off. The output of this process is sumarized in the following table.
+In this exercise the same procedure as in exercise 1 is carried out however  the red LED in the light sensor is turned off. The output of this process is summarized in the following table.
 
 Color | Percentage
 ----------- | -----
@@ -106,6 +106,8 @@ White | 762
 
 ![alt text](https://gitlab.au.dk/uploads/rene2014/lego/f828f01da7/FreeMemoryMeasurements.png "Exercise 6 - Measurements")
 
+From these data, we can see that using strings directly in will result in allocating a new string each time that code is invoked - that is, the JVM on the NXT does not perform string interning. Thus, using string litterals will result the GC being invoked more frequently.  
+
 ## Conclusion
 
-## Referencesg
+## References
\ No newline at end of file