diff --git a/00-notes.txt b/00-notes.txt
new file mode 100644
index 0000000..81144f4
--- /dev/null
+++ b/00-notes.txt
@@ -0,0 +1,24 @@
+= distribution
+* leading blog posts
+  * a new kind of programming book
+	* minimize text, maximize examples
+	* focus on working programs
+	* syntax highlighting
+  * select, actors, threads, and event loops
+  * small go programming examples
+* newsletter
+* twitter
+* stack overflow answers
+
+= pricing
+* high
+* updates
+* no drm
+* offers of free books in comments
+
+= source
+* popular github libraries
+* mailing list questions
+* stack overflow questions
+* handbook format
+* rosetta stone
diff --git a/37-concurrency.go b/37-concurrency.go
new file mode 100644
index 0000000..6090f05
--- /dev/null
+++ b/37-concurrency.go
@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+	"time"
+	"math/rand"
+)
+
+func f(n int) {
+    for i := 0; i < 10; i++ {
+        fmt.Println(n, ":", i)
+		time.Sleep(time.Millisecond * time.Duration(rand.Intn(150)))
+    }
+}
+
+func main() {
+    for i := 0; i < 5; i++ {
+		f(i)
+	}
+	fmt.Println()
+	for i := 0; i < 5; i++ {
+		go f(i)
+	}
+    var input string
+    fmt.Scanln(&input)
+}
diff --git a/38-channels.go b/38-channels.go
new file mode 100644
index 0000000..102c089
--- /dev/null
+++ b/38-channels.go
@@ -0,0 +1,10 @@
+package main
+
+import "fmt"
+
+func main() {
+    var messages chan string = make(chan string)
+    go func() { messages <- "ping"}()
+	msg := <- messages
+	fmt.Println(msg)
+}
diff --git a/39-buffering.go b/39-buffering.go
new file mode 100644
index 0000000..a9c29e5
--- /dev/null
+++ b/39-buffering.go
@@ -0,0 +1,10 @@
+package main
+
+import "fmt"
+
+func main() {
+    var messages chan string = make(chan string, 1)
+    messages <- "ping"
+	msg := <- messages
+	fmt.Println(msg)
+}