Jessi and Squeaks love watching clouds and birds fly way up in the sky! But why is the sky blue?
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SOURCES:

https://spaceplace.nasa.gov/blue-sky/en/
http://www.huffingtonpost.com/quora/h...
https://physics.stackexchange.com/que...
http://www.rookieparenting.com/why-is...
   • World's Most Asked Questions: Why is ...  
http://www.optics4kids.org/home/conte...