fix more broken links

docs/lessons.md

@@ -30,7 +30,6 @@
 * [Guess the Number](/lessons/guess-the-number),  guess a random number with pick number
 * [Counter](/lessons/counter), display a number with a variable
 * [Love Meter](/lessons/love-meter), create a love meter with on pin pressed
-* [Rock Paper Scissors](/lessons/rock-paper-scissors), create the classic game of rock paper scissors with if statement
 * [Truth or Dare](/lessons/truth-or-dare), a game that forces each player to reveal a secret or do something funny with if statement
 * [Spinner](/lessons/spinner), spin the arrow with multiple if statements
 * [Dice Roll](/lessons/dice-roll), spin with more if statements
@@ -43,7 +42,6 @@
 * [Zoomer](/lessons/zoomer), measure the force with acceleration
 * [Glowing Pendulum](/lessons/glowing-pendulum), construct a pendulum that glows using acceleration
 * [Classic Beatbox](/lessons/classic-beatbox), make a beatbox music player with variables
-* [Light Beatbox](/lessons/light-beatbox), make a beatbox music player with light level
 
 ### ~
 

docs/lessons/headbands.md

@@ -114,15 +114,6 @@ Computational Thinking Concept: AB = Abstraction; DE = Decomposition; AL = Algor
 * [tutorial](/lessons/headbands/activity)
 * [quiz](/lessons/headbands/quiz)
 
-## Extended Activity
-
-* time: 20 min.
-* [challenges](/lessons/headbands/challenges)
-
-## Homework
-
-* Extended Activity: [challenges](/lessons/headbands/challenges)
-
 ## Intended follow on
 
 Publish script to the classroom.

docs/reference/input/acceleration.md

@@ -38,5 +38,5 @@ basic.forever(() => {
 
 ### See also
 
-[compass-heading](/reference/input/compass-heading), [lightlevel](/reference/input/lightlevel)
+[compass-heading](/reference/input/compass-heading), [lightlevel](/reference/input/light-level)
 

docs/reference/music/play-tone.md

@@ -27,5 +27,6 @@ music.playTone(freq, 1000)
 
 ### See also
 
-[rest](/reference/music/rest), [ring tone](/reference/music/ring-tone) , [tempo](/reference/music/tempo), [set tempo](/reference/music/set-tempo), [change tempo by](/reference/music/change-tempo-by)
+[rest](/reference/music/rest), [ring tone](/reference/music/ring-tone) , [tempo](/reference/music/tempo), [set tempo](/reference/music/set-tempo), 
+[change tempo by](/reference/music/change-tempo-by)
 

docs/reference/radio/send-value.md

@@ -0,0 +1,29 @@
+# Send Number
+
+Broadcast a (name,number) pair to other micro:bits connected via ``radio``.
+
+### Parameters
+
+* name - a string to send
+* num - a number to send.
+
+### Simulator
+
+This function only works on the micro:bit, not in browsers.
+
+### Example: Broadcasting acceleration
+
+This example broadcasts the value of your micro:bit's ``acceleration`` in the `x` direction 
+(left and right) to other micro:bits.
+This kind of program might be useful in a model car or model rocket.
+
+```blocks
+input.onButtonPressed(Button.A, () => {
+    radio.sendValue("acc",input.acceleration(Dimension.X))
+})
+```
+
+### See also
+
+[receive number](/reference/radio/receive-number), [on data received](/reference/radio/on-data-received)
+

docs/typescript.md

@@ -1,4 +1,4 @@
-# Typescript
+# TypeScript
 
 You can write micro:bit programs in a subset of [TypeScript](https://www.typescriptlang.org). 
 TypeScript itself is a superset of JavaScript, and many micro:bit programs,