When you bite into an apple, the flesh deforms, and at a certain moment the cell walls burst. And there is your crunch. (Ditto crispy snack foods, but here the bubbles are filled with air.)
The forestomach of a killer whale, a far smaller creature, has been measured, unstretched, at five feet by seven feet—about as big as a room in a Tokyo capsule hotel, with a similar dearth of amenities.
Oh snap ;-P
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