There are bunch of videos out there explaining why the sky is blue, but let's go a little deeper into the optics. Why does color matter? What's a vibrational resonance? What's actually happening on the subatomic level?
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VIDEO ANNOTATIONS/CARDS

Why isn't EVERYTHING a Mirror?
   • Why aren't Mirrors White? Why isn't E...  

Where Does Light Come From?
   • Where Does Light Come From? (Electrod...  

The Color White Does NOT Exist:
   • The Color White Does NOT Exist  
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RELATED YOUTUBE VIDEOS

MinutePhysics on the Blue Sky:
   • Why is the Sun Yellow and the Sky Blue?  
   • Why Isn't The Sky Purple?  

Veritasium on the Blue Sky:
   • Why the Sky ISN'T Blue  

This Place on the Blue Sky:
   • The sky is blue.  Why isn't everythin...  

SciShow on the Blue Sky:
   • World's Most Asked Questions: Why is ...  
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OTHER SOURCES

https://spaceplace.nasa.gov/bluesky/en/
http://hyperphysics.phyastr.gsu.edu/...
http://hyperphysics.phyastr.gsu.edu/...
http://hyperphysics.phyastr.gsu.edu/...
http://farside.ph.utexas.edu/teaching...
http://munley.weebly.com/resonancean...
http://www.nat.vu.nl/en/sec/atom/Publ...
https://www.wolframalpha.com/input/?i...

https://www.engineeringtoolbox.com/me...
https://www.engineeringtoolbox.com/li...
https://www.engineeringtoolbox.com/ga...

Optics by Hecht

Tai Danai on Tensors:
https://www.math3ma.com/blog/thetens...
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LINKS TO COMMENTS

   • What the HECK is a Tensor?!?  
   • What the HECK is a Tensor?!?  
   • What the HECK is a Tensor?!?  
   • What the HECK is a Tensor?!?  
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IMAGE CREDITS

Lord Rayleigh:
https://commons.wikimedia.org/wiki/Fi...