How is it we see the sky as blue? will get you the right answer to the question but if what you seek to understand is how a plane stay aloft in the sky you will be sorrily disappointed in the answer and still no closer to your understanding.
Printed copy · Anthology Volume 5, page 314Printed copy from The Tender For Law Anthology, Volume 5, page 314 (printed 13 June 2014). Added by this site; not part of the Facebook export.