[en] The presence of a mild turbulence inside rotating stars has been considered previously in connection with the problem of the solar flattening. The possibility of using abundance determination to test the existence of that turbulence has also been considered. It is only recently that the interpretation of the abundance determination of lithium in giants has brought a reasonable proof of the existence of a mild turbulence deep in stars. Further proof is given by the consideration of the solar neutrino flux. These results suggest important modification to stellar evolution patterns. (Auth.)