scale & growth : intro page

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Scale & Growth
	•	Introduction

Height vs. Area & Volume
	•	Introduction to Section
	•	Balancing Playdough
	•	On Magnitude & Proportion
	•	The Shape of Volcanoes
	•	The Shape of the Earth
	•	The Shapes of Planets & Moons

Giants & Dwarfs
	•	Introduction to Section
	•	Tall Playdough
	•	Giant Brobdingnags
	•	Tiny Lilliputians
	•	Walking Speed
	•	Body Mass Index
	•	Babies vs. Adults
	•	Alice, Gulliver, & Goliath

Size, Form, & Function
	•	Introduction to Section
	•	Ion Size & Solubility
	•	Bones, Teeth, & Digestion
	•	Brain Sizes: Fact, Fallacy, & Fiction

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In this chapter we consider questions of proportion: Why is a (small) hummingbird so different in shape from a (tall) heron?

To understand the answer to this -- and similar questions, we start by first exploring the relationships between height, area, and volume of similarly shaped objects. If an object is twice as tall as a similar object, does it weigh twice as much?

From this we pass to physical considerations: since weight is proportional to volume, but strength is proportional to cross-sectional area, a change in size forces changes in shape. What kind of changes? How do people (or dinosaurs) change shape as they grow?

We end with some questions of size affecting shape through additional forces, besides strength and weight.