Emmett Till Biography. The brutal 1955 murder of teenager Emmett Till, and the news coverage it drew, helped ignite the civil rights movement in America in the 1950s. Exactly what Emmett Till, a 14-year-old African American boy, said or did to offend Carolyn Bryant, a 21-year-old white woman working in a Mississippi grocery store, is unclear; he may have whistled at her.
There's no major difference. The benefit of the default instance is that you connect just by specifying the server name (eg, MYSERVER), whereas a named instance will require an instance name as well (eg, MYSERVER\SQL2005). If you're only going to install one version of SQL Server on this machine, go with a default.
First you must understand that classes are instances too -- instances of the Class class. Once you understand that, you can understand that a class can have instance variables associated with it just as a regular (read: non-class) object can. Note that an instance variable on Hello is completely unrelated to and distinct from an instance variable on an instance of Hello. A class variable on the other hand is a kind of combination of the above two, as it accessible on Hello itself and its instances, as well as on subclasses of Hello and their instances: