Why Do Stars Twinkle?

SciShow explains why stars do that twinkling that all the kids are singing about, and explains how astronomers can get around it to make observations, and why it can be kinda useful.
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Sources:
http://www.universetoday.com/25345/why-do-stars-twinkle/
http://www.scientificamerican.com/article/why-do-stars-twinkle/
http://www.livescience.com/32315-why-do-stars-twinkle.html
http://curious.astro.cornell.edu/question.php?number=114
http://adsabs.harvard.edu/full/1952JRASC..46..191E