diff --git a/Introduction to Objects/Constructors/Examples/src/VisibleArgs.kt b/Introduction to Objects/Constructors/Examples/src/VisibleArgs.kt
index 30c96fd8..283eee4f 100644
--- a/Introduction to Objects/Constructors/Examples/src/VisibleArgs.kt	
+++ b/Introduction to Objects/Constructors/Examples/src/VisibleArgs.kt	
@@ -8,7 +8,7 @@ fun main() {
   val alien1 =
     MutableNameAlien("Reverse Giraffe")
   val alien2 =
-    FixedNameAlien("Krombopolis Michael")
+    FixedNameAlien("Krombopulos Michael")
 
   alien1.name = "Parasite"
   // Can't do this:
diff --git a/Introduction to Objects/Testing/Examples/src/TestingExample.kt b/Introduction to Objects/Testing/Examples/src/TestingExample.kt
index ea1055ea..214ba12b 100644
--- a/Introduction to Objects/Testing/Examples/src/TestingExample.kt	
+++ b/Introduction to Objects/Testing/Examples/src/TestingExample.kt	
@@ -10,10 +10,10 @@ fun main() {
   v2 eq "Ontology"
 
   // 'neq' means "not equal"
-  v2 neq "Epistimology"
+  v2 neq "Epistemology"
 
-  // [Error] Epistimology != Ontology
-  // v2 eq "Epistimology"
+  // [Error] Epistemology != Ontology
+  // v2 eq "Epistemology"
 }
 /* Output:
 11
diff --git a/Programming Basics/Booleans/Examples/src/Closed.kt b/Programming Basics/Booleans/Examples/src/Closed.kt
index de1c2a24..518eb1bd 100644
--- a/Programming Basics/Booleans/Examples/src/Closed.kt	
+++ b/Programming Basics/Booleans/Examples/src/Closed.kt	
@@ -4,7 +4,7 @@ fun isClosed(hour: Int) {
   val open = 9
   val closed = 20
   println("Operating hours: $open - $closed")
-  val status = hour < open || hour > closed
+  val status = hour < open || hour >= closed
   println("Closed: $status")
 }
 
diff --git a/Programming Basics/Booleans/Examples/src/Open1.kt b/Programming Basics/Booleans/Examples/src/Open1.kt
index 6b997160..f51c7f3c 100644
--- a/Programming Basics/Booleans/Examples/src/Open1.kt	
+++ b/Programming Basics/Booleans/Examples/src/Open1.kt	
@@ -5,7 +5,7 @@ fun isOpen1(hour: Int) {
   val closed = 20
   println("Operating hours: $open - $closed")
   val status =
-    if (hour >= open && hour <= closed) // [1]
+    if (hour >= open && hour < closed) // [1]
       true
     else
       false
diff --git a/Programming Basics/Booleans/Examples/src/Open2.kt b/Programming Basics/Booleans/Examples/src/Open2.kt
index a22db59a..f3ecc7ec 100644
--- a/Programming Basics/Booleans/Examples/src/Open2.kt	
+++ b/Programming Basics/Booleans/Examples/src/Open2.kt	
@@ -4,7 +4,7 @@ fun isOpen2(hour: Int) {
   val open = 9
   val closed = 20
   println("Operating hours: $open - $closed")
-  val status = hour >= open && hour <= closed
+  val status = hour >= open && hour < closed
   println("Open: $status")
 }
 
diff --git a/Programming Basics/Summary 1/Examples/src/Booleans.kt b/Programming Basics/Summary 1/Examples/src/Booleans.kt
index 5cc6c02a..d03b565d 100644
--- a/Programming Basics/Summary 1/Examples/src/Booleans.kt	
+++ b/Programming Basics/Summary 1/Examples/src/Booleans.kt	
@@ -7,11 +7,11 @@ fun main() {
   val hour = 6
   println("Current time: " + hour)
 
-  val isOpen = hour >= opens && hour <= closes
+  val isOpen = hour >= opens && hour < closes
   println("Open: " + isOpen)
   println("Not open: " + !isOpen)
 
-  val isClosed = hour < opens || hour > closes
+  val isClosed = hour < opens || hour >= closes
   println("Closed: " + isClosed)
 }
 /* Output:
diff --git a/Programming Basics/Summary 1/Examples/src/IfExpression.kt b/Programming Basics/Summary 1/Examples/src/IfExpression.kt
index 590956b6..60716e22 100644
--- a/Programming Basics/Summary 1/Examples/src/IfExpression.kt	
+++ b/Programming Basics/Summary 1/Examples/src/IfExpression.kt	
@@ -11,7 +11,7 @@ fun main() {
     val closes = 20
     println("Operating hours: " +
       opens + " - " + closes)
-    hour >= opens && hour <= closes
+    hour >= opens && hour < closes
   } else {
     false
   }
diff --git a/Usability/Data Classes/Examples/src/CopyDataClass.kt b/Usability/Data Classes/Examples/src/CopyDataClass.kt
index 04a04049..5ef58aee 100644
--- a/Usability/Data Classes/Examples/src/CopyDataClass.kt	
+++ b/Usability/Data Classes/Examples/src/CopyDataClass.kt	
@@ -14,7 +14,7 @@ fun main() {
     "Miffy",
     "Miller",
     "1-234-567890",
-    "1600 Amphitheatre Parkway")
+    "1600 Amphitheater Parkway")
   val newContact = contact.copy(
     number = "098-765-4321",
     address = "Brandschenkestrasse 110")