A quad, or quadruple, is a figure skating jump with at least four (but fewer than five) revolutions.
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The Physics Behind the Quadruple Axel, the Most Difficult Jump in Figure Skating
ALMA observations show how double, triple, quadruple and quintuple star systems form simultaneously in a molecular cloud
Quadruple Take: Unlocking Dark Matter Mysteries With Multiply-Imaged Gravitationally Lensed Supernova
Electric School Bus Fleet Will Quadruple with $1 Billion in Funding
