nat geo history books Why Do We Yawn? Find out in "Why?"

Ever wonder: Why do I cry? Why is the sky blue? Why do zebras have stripes? If you’ve got questions, this book has answers – 1,111 of them, in fact, on all kinds of fun and fascinating subjects. Get it here!

Amazon: http://www.amazon.com/gp/product/1426...

B&N: http://www.barnesandnoble.com/w/natio...

National Geographic Store:
http://shop.nationalgeographic.com/ng...

nat geo history books Why Do We Yawn? Find out in "Why?"
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