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/*:
 
 ## What is nil, really?
 
 Try typing the following code:
 
 ![what-happens](what-happens.png)
 
 Now run the playground.
 
 What is the result?
 */
// Type the code below this line...

/*:
 
 After you try this, change the code on line 16 to:
 
 ![set-a-value](set-a-value.png)
 
 Run the program again.
 
 What is the result?  What does this imply?
 
 Write down your thoughts in your portfolio entry for today.
 
 */
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