1.22 What total volume of air does a person breathe in a lifetime? How does that compare with the volume of the Houston Astrodome? (Estimate that a person breathes about 500 cm3) of air with each breath.)
1.23 How many hairs do you have on your head?
1.24 How many times does a human heart beat during a lifetime? How many gallons of blood does it pump? (Estimate that the heart pumps 50 cm3 of blood with each beat.)
1.25 In Wagner's opera Ring of the Nibelung, the goddess Freia is ransomed for a pile of gold just tall enough and wide enough to hide her from sight. Estimate the monetary value of this pile. (Refer to Example 1.4 for information on the price per ounce and density of gold.)
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