A Wonderleaf question

a real page from the book
Ears pop on airplanes because air pressure changes faster than the air behind your eardrum can adjust. A small passage called the Eustachian tube opens when you swallow or yawn, letting air move until both sides match again.
During takeoff, outside pressure drops; during landing, it rises. Either change can bend the eardrum a little, making ears feel plugged. The pop is the moment the pressure evens out and the eardrum can sit comfortably again.
Practice swallowing, yawning, and chewing pretend gum, then notice which motion makes your ears feel most open.
Watercolour scenes, straight answers, about three minutes cover to cover.
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