diff --git a/collects/teachpack/2htdp/scribblings/nuworld.ss b/collects/teachpack/2htdp/scribblings/nuworld.ss
deleted file mode 100644
index 56a536a350..0000000000
--- a/collects/teachpack/2htdp/scribblings/nuworld.ss
+++ /dev/null
@@ -1,119 +0,0 @@
-#lang slideshow
-
-(require slideshow/pict mred/mred)
-
-(define DELTA 80)
-(define FT 12)
-
-(define txt 
-  '("(big-bang World_0"
-    "  (on-draw render WIDTH HEIGHT)"
-    "  (on-tick tock RATE)"
-    "  (on-mouse click)"
-    "  (on-key react))"
-    ))
-
-(define program 
-  (apply vl-append (map (lambda (t) (text t '() (- FT 2))) txt)))
-
-(define Program 
-  (cc-superimpose 
-   (rectangle (+ 5 (pict-width program)) (+ 5 (pict-height program)))
-   program))
-
-(define (make-state txt)
-  (define t (text txt '() FT))
-  (define e (rounded-rectangle (+ 10 (pict-width t)) (+ DELTA (pict-height t))))
-  (cc-superimpose t e))
-
-(define False (text "FALSE" '() FT))
-(define True  (text "TRUE"  '() FT))
-(define BOOL  (rectangle (+ 5 (pict-width False)) (+ 5 (pict-height False))))
-
-;; String Boolean -> Pict 
-(define (make-state0 txt b)
-  ;; create the basic state
-  (define t (text txt '() FT))
-  (define s (if b 
-                (cc-superimpose 
-                 (rounded-rectangle (+ 5 (pict-width t))  (+ (- DELTA 5) (pict-height t)))
-                 t)
-                t))
-  (define w 
-    (cc-superimpose 
-     s
-     (rounded-rectangle (+ 10 (pict-width t)) (+ DELTA (pict-height t)))))
-  ;; add the boolean 
-  (define bb (cc-superimpose (if b True False) BOOL))
-  (define ar (add-labeled-arrow (vc-append DELTA bb w) w ct-find bb cb-find "done"))
-  (define scene (text "Scene" '() FT))
-  (define sc (cc-superimpose scene (rectangle (+ 20 (pict-width scene)) (+ 30 (pict-height scene)))))
-  (define br (add-labeled-arrow (vc-append DELTA ar sc) ar cb-find sc ct-find "render"))
-  br)
-
-(define (add-labeled-arrow nx locked lb-find closed lt-find txt)
-  (define-values (x0 y0) (lb-find nx locked))
-  (define-values (x1 y1) (lt-find nx closed))
-  (define lbl (text txt '() (- FT 2)))
-  (define wlbl (pict-width lbl))
-  (define hlbl (pict-height lbl))
-  (define x (- x0 (/ wlbl 2)))
-  (define y (+ y0 (/ ( - y1 y0 hlbl) 2)))
-  (pin-over (pin-arrow-line 4.0 nx locked lb-find closed lt-find) x y lbl))
-
-(define (h-labeled-arrow t)
-  (define tock (text t '() (- FT 2)))
-  (define blk (blank (+ DELTA 4) 2))
-  (vc-append tock (pin-arrow-line 4.0 blk blk lc-find blk rc-find)))
-
-(define arrows
-  (vc-append (h-labeled-arrow "tock")
-             (h-labeled-arrow "click")
-             (h-labeled-arrow "react")))
-
-(define state0 (make-state0 "World_0" #f))
-(define state1 (make-state0 "World_1" #f))
-(define dots   (cc-superimpose (blank (pict-width state1) (pict-height state1)) (text "..." '() FT)))
-(define state2 (make-state0 "World_N-1" #f))
-(define stateN (make-state0 "World_N" #t))
-(define states (list state0 arrows state1 arrows dots arrows state2 arrows stateN))
-
-(define bg (blank (+ (apply + (map pict-width states))
-                         DELTA #;(* (length states) DELTA))
-                      (+ (pict-height state0) DELTA)))
-
-(define (center base state x)
-  (define w (pict-height state))
-  (define d (quotient (- width w) 2))
-  (pin-over base x d state))
-
-(define width (pict-height bg))
-
-(define x (* 1/2 DELTA))
-(define xx 
-  (foldl (lambda (f ls s)
-           (define y (center s f x))
-           (set! x (+ x ls))
-           y)
-         bg
-         states
-         (map (lambda (x) (+ (pict-width x) #;(* 1/1 DELTA))) states)))
-
-(define the-image (ct-superimpose xx Program))
-
-(define image-bm
-  (make-object bitmap% 
-    (inexact->exact (round (pict-width the-image)))
-    (inexact->exact (round (pict-height the-image)))))
-
-(send image-bm ok?)
-
-(define image-dc
-  (new bitmap-dc% [bitmap image-bm]))
-(send image-dc clear)
-
-(draw-pict the-image image-dc 0.0 0.0)
-
-(send image-bm save-file "nuworld.png" 'png)
-
-the-image