0:28 - Primitive variables
0:57 - Object reference variables
1:53 - Memory allocation for primitives & object reference variables
2:50 - Overview of private class Thing (used to demonstrate references later)
3:42 - Declaring primitive & object reference variables
5:00 - Printing out the values of the variables
6:30 - Using = with object reference variables (spoiler: don't do it unless you really mean to, but you probably don't!)
