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+Every powerful programming language should have the following three things:
+* Primitive data types and procedures
+* Means to create compound elements from primitive ones
+* Means to create abstractions; compound elements are named and can be manipulated
+
+Primitives are elementary particles of programming languages.
+Primitive data are booleans, integer numbers, floating point numbers and characters (which are encoded as integers).
+Primitive procedures operate on primitive data: + * /  etc.
+
+Expression: anything that has a result.
+Combination: list of expressions wrapped (delimited) by parenthesis
+             (+ 1 2)
+              ^ --> operands -> evaluate -> arguments 
+          operator                          |
+              ^                             |
+          procedure <-----------------------<
+
+prefix notation: 
+ - unambigously specify any nr of operands
+ - arbritary nesting (+ 1 (+ 1 (+ 1 2))) is easy
+
+bookmark: https://sarabander.github.io/sicp/html/1_002e1.xhtml#g_t1_002e1 1.1.2