Dr. Leonard Hofstader and Dr. Sheldon Cooper are the other two. 
I believe that Howard Wolowitz is the only engineer.
        
                    
             
        
        
        
Answer:Black History Month is an annual observance originating in the United States, where it is also known as African-American History Month. It has received official recognition from governments in the United States and Canada, and more recently has been observed in Ireland, the Netherlands, and the United Kingdom.
Explanation:
 
        
                    
             
        
        
        
Pursuing vocational training after high school graduation has several positive outcomes, such as higher wages, improved productivity, and economic growth.
This is the sentence.
Hope this helps!
Also, try not to use rude words, it may prevent others from helping you. :(
Thanks.
        
             
        
        
        
I'm confused. Are you asking ''What happened when...'' or asking for our imput on what we think should have happened?