diff --git a/koans/about_constants.rb b/koans/about_constants.rb
index 006f1c0..41d3f01 100644
--- a/koans/about_constants.rb
+++ b/koans/about_constants.rb
@@ -81,7 +81,7 @@ class AboutConstants < EdgeCase::Koan
     assert_equal __, MyAnimals::Oyster.new.legs_in_oyster
   end
 
-  # QUESTION: Now Which has precedence: The constant in the lexical
-  # scope, or the constant from the inheritance heirarachy?  Why is it
+  # QUESTION: Now which has precedence: The constant in the lexical
+  # scope, or the constant from the inheritance hierarchy?  Why is it
   # different than the previous answer?
 end
diff --git a/koans/about_iteration.rb b/koans/about_iteration.rb
index 591b869..5c5a2b0 100644
--- a/koans/about_iteration.rb
+++ b/koans/about_iteration.rb
@@ -65,7 +65,7 @@ class AboutIteration < EdgeCase::Koan
     result = [2, 3, 4].inject(0) { |sum, item| sum + item }
     assert_equal __, result
 
-    result2 = [2, 3, 4].inject(1) { |sum, item| sum * item }
+    result2 = [2, 3, 4].inject(1) { |product, item| product * item }
     assert_equal __, result2
 
     # Extra Credit:
diff --git a/koans/about_message_passing.rb b/koans/about_message_passing.rb
index 45541a0..a978dde 100644
--- a/koans/about_message_passing.rb
+++ b/koans/about_message_passing.rb
@@ -99,7 +99,7 @@ class AboutMessagePassing < EdgeCase::Koan
     # keep in mind you can't call method_missing like that in Ruby
     # 1.9. normally.
     #
-    # Thanks.  We now return you to your regularly schedule Ruby
+    # Thanks.  We now return you to your regularly scheduled Ruby
     # Koans.
   end