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How the Tiger Really Got His Stripes

The New Yorker

Imagine grasshoppers distributed evenly across a dry field. As the temperature rises, the grasshoppers start to sweat. The field catches fire in a few spots and starts to spread. What kind of burn pattern will appear in the field? If the grasshoppers sweat more, or less, or if the fire spreads faster, or slower--how will that alter the burn pattern?