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diff --git a/chicken-5.org b/chicken-5.org
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--- a/chicken-5.org
+++ b/chicken-5.org
@@ -116,6 +116,21 @@ Spec defines system, subset is allowed (see later)
 (+ 3/4 1/2) ;; yes, this returns 5/4
 #+END_SRC
 
+* Scheme superpowers: REPL
+
+** Read-Eval-Print-Loop
+
+*** Interpreter prompt allows you to explore
+
+  Type an expression  (read)
+  Have it evaluated   (eval)
+  See the result      (print)
+  Go to start         (loop)
+
+  Most interpreters do this now.
+  Done right, can shape your way of thinking.
+  LISP machines did it best! (SLIME/Geiser)
+
 * CHICKEN: intro
 
  /Implementation/ of Scheme (one of the few