Why Do Cats Knead?

SciShow tackles one of the cutest questions ever: Why cats knead. You might have heard the theory, but do you know what adult cats would hold on to kitten-like behavior? The answers await!
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Sources:
http://www.smithsonianmag.com/history...
http://www.smcm.edu/psyc/_assets/docu...
http://www.livescience.com/40548-why-...
http://bigcatrescue.org/wildcat-facts/