diff --git a/MIT/sqrt.scm b/MIT/sqrt.scm
new file mode 100644
index 0000000..1bccffa
--- /dev/null
+++ b/MIT/sqrt.scm
@@ -0,0 +1,14 @@
+(define (sqrt x)
+  (define tolerance 0.00001)
+  (define (good-enough? y)
+    (< (abs (- (* y y) x)) tolerance))
+  (define (improve y)
+    (average (/ x y) y))
+  (define (try y)
+    (if (good-enough? y)
+	y
+	(try (improve y))))
+  (try 1))
+(sqrt 13)
+    
+    
diff --git a/Structure/test.scm b/Structure/test.scm
new file mode 100644
index 0000000..2869d81
--- /dev/null
+++ b/Structure/test.scm
@@ -0,0 +1 @@
+(define add2(+ 2))
diff --git a/fixum/hello.scm b/fixum/hello.scm
new file mode 100644
index 0000000..18623f6
--- /dev/null
+++ b/fixum/hello.scm
@@ -0,0 +1,5 @@
+; The first program
+
+(begin
+  (display "Hello, World!")
+  (newline))
diff --git a/tortoise/tortoise b/tortoise/tortoise
index 9e9a088..6932034 100755
Binary files a/tortoise/tortoise and b/tortoise/tortoise differ