books.google.com - How heavy is that cloud? Why can you see farther in rain than in fog? Why are the droplets on that spider web spaced apart so evenly? If you have ever asked questions like these while outdoors, and wondered how you might figure out the answers, this is a book for you. An entertaining and informative...https://books.google.com/books/about/A_Mathematical_Nature_Walk.html?id=5ou-E9UKS_AC&q=proportional&utm_source=gb-gplus-shareA Mathematical Nature Walk

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