* The electromagnetic spectrum or rainbows.
	
* Scattering and reflection of light or why is the sky blue?
	
* Interference of waves or beautiful patterns.
	
* Travelling waves, standing waves and harmony.
  	
* Natural vibrations or watch out for the opera singer
	
* Vibrations and music or feel those vibes.	

* Electrons as waves or the music of nature.
	
* An explanation of the Periodic Table or chemistry is  
  understandable.