Fidget spinners are hand-held toys based on a roller bearing and three weighted lobes, which can spin freely, creating centrifugal force when activated manually. Generating centrifugal force with a fidget spinner takes neither electricity nor trained staff. And that has suggested to several researchers that such spinners, under the right circumstances, could be used for centrifugation under circumstances where reliably operating a centrifuge, for  whatever reason, is a challenge.