diff --git a/00-notes.txt b/00-notes.txt
index 81144f4..e1bd62c 100644
--- a/00-notes.txt
+++ b/00-notes.txt
@@ -22,3 +22,10 @@
 * stack overflow questions
 * handbook format
 * rosetta stone
+* building an actual fucking app
+  * versioned transitive libraries and pegging
+  * creating and distributing packages, putting on github
+  * distributing go binary programs
+  * deploying to heroku
+  * sort-by
+  * errors
diff --git a/11b-case.go b/11b-case.go
new file mode 100644
index 0000000..e5b0f65
--- /dev/null
+++ b/11b-case.go
@@ -0,0 +1,16 @@
+package main
+
+import "fmt"
+
+func main() {
+	i := 3
+	switch i {
+		case 0: fmt.Println("Zero")
+		case 1: fmt.Println("One")
+		case 2: fmt.Println("Two")
+		case 3: fmt.Println("Three")
+		case 4: fmt.Println("Four")
+		case 5: fmt.Println("Five")
+		default: fmt.Println("Unknown Number")
+	}
+}
diff --git a/42-select.go b/42-select.go
new file mode 100644
index 0000000..fe78174
--- /dev/null
+++ b/42-select.go
@@ -0,0 +1,31 @@
+package main
+
+import ("fmt"; "time")
+
+func main() {
+    c1 := make(chan string)
+    c2 := make(chan string)
+	d  := make(chan bool, 1)
+
+    go func() {
+        time.Sleep(time.Millisecond * 1500)
+		c1 <- "from 1"
+    }()
+    go func() {
+        time.Sleep(time.Millisecond * 2000)
+		c2 <- "from 2"
+    }()
+
+    go func() {
+        for i :=0; i < 2; i ++ {
+            select {
+            case msg1 := <- c1:
+                fmt.Println(msg1)
+            case msg2 := <- c2:
+                fmt.Println(msg2)
+            }
+        }
+		d <- true
+    }()
+	<- d
+}
diff --git a/43-timeout.go b/43-timeout.go
new file mode 100644
index 0000000..95234bb
--- /dev/null
+++ b/43-timeout.go
@@ -0,0 +1,24 @@
+package main
+
+import ("fmt"; "time")
+
+func main() {
+    c := make(chan string)
+	d := make(chan bool, 1)
+
+    go func() {
+        time.Sleep(time.Millisecond * 1500)
+		c <- "ready"
+    }()
+
+    go func() {
+      select {
+      case msg := <- c:
+          fmt.Println(msg)
+      case <- time.After(time.Millisecond * 1000):
+           fmt.Println("timeout")
+       }
+	   d <- true
+    }()		
+	<- d
+}
diff --git a/44-strings.go b/44-strings.go
new file mode 100644
index 0000000..e77506e
--- /dev/null
+++ b/44-strings.go
@@ -0,0 +1,21 @@
+package main
+
+import ("fmt"; "strings")
+
+func p(o interface{}) {
+	fmt.Println(o)
+}
+
+func main() {
+    p(strings.Contains("test", "es"))
+    p(strings.Count("test", "t"))
+    p(strings.HasPrefix("test", "te"))
+    p(strings.HasSuffix("test", "st"))
+	p(strings.Index("test", "e"))
+    p(strings.Join([]string{"a","b"}, "-"))
+    p(strings.Repeat("a", 5))
+    p(strings.Replace("aaaa", "a", "b", 2))
+    p(strings.Split("a-b-c-d-e", "-"))
+    p(strings.ToLower("TEST"))
+    p(strings.ToUpper("test"))
+}
diff --git a/45-bytes.go b/45-bytes.go
new file mode 100644
index 0000000..e7126fb
--- /dev/null
+++ b/45-bytes.go
@@ -0,0 +1,10 @@
+package main
+
+import "fmt"
+
+func main() {
+	arr := []byte("some bytes")
+	str := string([]byte{'a', ' ', 's', 't', 'r', 'i', 'n', 'g'})
+	fmt.Println(arr)
+	fmt.Println(str)
+}
diff --git a/xx-exit b/xx-exit
new file mode 100755
index 0000000..c3f482c
Binary files /dev/null and b/xx-exit differ
diff --git a/xx-exit.go b/xx-exit.go
new file mode 100644
index 0000000..0d37cc9
--- /dev/null
+++ b/xx-exit.go
@@ -0,0 +1,14 @@
+package main
+
+import "os"
+
+func main() {
+	os.Exit(3)
+}
+
+// $ go run xx-exit.go
+// exit status 3
+// $ go build xx-exit.go
+// $ ./xx-exit
+// $ echo $?
+// 3