A quad, or quadruple, is a figure skating jump with at least four (but fewer than five) revolutions.
Read more in the app
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
