Dropping Pumpkins
by Wyna Liu

Puzzlemaker Wyna Liu drew inspiration for this issue’s The Stack from Caltech’s annual Pumpkin Drop. Since 1972, Caltech students have celebrated Halloween with delightful destruction—smashing liquid-nitrogen-frozen pumpkins from the tallest building on campus at the stroke of midnight. In recent years, the event has attracted large crowds of spectators, who watch safely from a distance, as pumpkin debris explodes into the night of tricks and treats.
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