+Like most computer languages, R uses variables as a means of storing
+information in memory and retrieving it later. A variable
+
+In R, variables are more correctly called objects, because they have
+structure and do not directly refer to a memory.
+
+Basic Types
+----------
+
+Vectors
+=======
+
+A vector is the major data type used in R. You can think of it as a
+line of cells, each containing a value of the same type.
+[Type here means a number or a string.]
+
+
+Lists
+=====
+
+
+Object Attributes
+-----------------