non-dead link about scheme's history

diff --git a/worlds/bricabrac.scm b/worlds/bricabrac.scm
index 459686d1cd9a23737e750e3a1b57252261ded6c3..6dc44878fb0667be676aee2bfec4948210d4b633 100644 (file)
--- a/worlds/bricabrac.scm
+++ b/worlds/bricabrac.scm
@@ -2243,7 +2243,7 @@ comments, and so on flowing from node to node."
       (p
        (ul
         (li (b "Scheme") " "
       (p
        (ul
         (li (b "Scheme") " "

-            (a "http://cs.au.dk/~hosc/local/HOSC-11-4-pp399-404.pdf"
+            (a "https://en.wikipedia.org/wiki/History_of_the_Scheme_programming_language"

                "was originally started ")
             " to explore the " (b "actor model")
             ". (It became more focused around studying the " (b "lambda calculus")
                "was originally started ")
             " to explore the " (b "actor model")
             ". (It became more focused around studying the " (b "lambda calculus")