U1 - Lesson 2 - Self Check 1
                                    Completion requirements
                                    
                                    
                                        
                                    
                                
                        
                        Self Check 1 - Lesson 2
Self-Checks
 allow you to see if you are understanding the concepts that you just 
studied. You are allowed an unlimited amount of attempts for these. 
Therefore, redo them often! These are NOT graded.
Grading method: Highest grade