Why is the sky blue?
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Here are some useful sources:

  1. Burton S, Blair E. 1991. Task conditions, response formulation processes, and response accuracy for behavioral frequency questions in surveys. Public Opin. Q. 55:50–79
  2. Cliff N. 1959. Adverbs as multipliers. Psychol. Rev. 66:27–44
  3. Bryner, Jeanna. “Why Kids Ask Why.” Live Science. Live Science, 23 Nov. 2009. Web. 9 Oct. 2016.
  4. Natto, Chris. “Why is it important to ask ‘Why?’” Mentor Works. 5 November 2015. Web. 9 Oct. 2016
  5. Cheng, P.W. (1997). “From Covariation to Causation: A Causal Power Theory”.Psychological Review. 104: 367–405.
  6. Merriam-Webster.com Merriam-Webster Dictionary definition of why
  7. Jackman MR. 1973. Education and prejudice or education and response set? Am. Sociol. Rev. 38:327–39
  8. “Why Is the Sky Blue.” NASA. NASA, n.d. Web. 10 Oct. 2016.
  9. Gibbs, Philip. “Why Is the Sky Blue?” Why Is the Sky Blue? N.p., May 1997. Web. 9 Oct. 2016.
  10. Vale, Ronald D. “The Value of Asking Questions.” Molecular Biology of the Cell. The American Society for Cell Biology, 15 Mar. 2013. Web. 10 Oct. 2016.

and here are 10 search terms useful for my topic:

1. why

2. blue

3. philosophy

4. questions

5. asking

6. science

7. understanding

8. meaning

9. simple

10. answers