Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 12 - Think and Explain: 71

Answer

Curling up into a ball exposes less skin area to the environment, which helps retain body heat. Calculus can be used to show that a sphere has minimal surface area for the volume it encloses.
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