User:Fornwall/sandbox

$$ \text{Period}=\frac{1}{\text{Frequency}}=\frac{1}{\frac{300 \text{ billion birds}}{4\pi\times\text{Earth radius}^2}\times 1\frac{\frac{\text{poop}}{\text{bird}}}{\text{hour}}\times16\frac{\text{hours}}{\text{day}}\times 1 \frac{\text{mouth}}{\text{poop}}\times 15 \frac{\text{ cm}^2}{\text{mouth}}}=195\text{ years} $$

$$ \frac{300\text{ billion birds} \times 0.5\frac{\text{fluid oz}}{\text{day}}}{3\text{ trillion}\frac{\mathrm{miles}}{\text{year}}}=0.335 \mathrm{ mm}^2 = 13\text{ miles per gallon} $$

($$\text{length}^3$$). So gallons/mile is ($$\frac{\text{length}^3}{\text{length}}$$). That’s just ($$\text{length}^2$$)