How And Why Do Cats Purr

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=7_zKkBKu1fs

Cats purr for all kinds of reasons, including communication and healing themselves. Cristen explains how purring works and which cats can't do it. • Whether the topic is popcorn or particle physics, you can count on the HowStuffWorks team to explore - and explain - the everyday science in the world around us on BrainStuff. • Download the New TestTube iOS app! http://testu.be/1ndmmMq • Watch More BrainStuff on TestTube http://testtube.com/brainstuff • Subscribe Now! http://www.youtube.com/subscription_c... • Watch More / brainstuffshow • Twitter / brainstuffhsw • Facebook / brainstuff • Google+ http://gplus.to/BrainStuff

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