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Fruits of Ruellia ciliatiflora (Acanthaceae) explosively launch small (2.5 mm diameter Â 0.46 mm thick), disc-shaped seeds at velocities over 15 m s 21 , reaching distances of up to 7 m. Through high-speed video analysis, we observe that seeds fly with extraordinary backspin of up to 1660 Hz. By modelling the seeds as spinning discs, we show that flying with backspin is stable against gyroscopic precession. This stable backspin orientation minimizes the frontal area during flight, decreasingdoi:10.1098/rsif.2017.0901 pmid:29514987 fatcat:2a2li3v2sfazxerzsygx3tlcnm