Why Isn't The Sky Purple?

Get a free audiobook at http://www.audible.com/minutephysics
Why isn't the sky violet?

MinutePhysics is on Google+ - http://bit.ly/qzEwc6
And facebook - http://facebook.com/minutephysics
And twitter - @minutephysics

Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all in a minute!

Music by Nathaniel Schroeder http://www.soundcloud.com/drschroeder Created by Henry Reich
...
https://www.youtube.com/watch?v=R5P6O0pDyMU