  The latest data released by the BaBar Collaboration on azimuthal correlations
measured for pion-kaon and kaon-kaon pairs produced in $e^+e^-$ annihilations
allow, for the first time, a direct extraction of the kaon Collins functions.
These functions are then used to compute the kaon Collins asymmetries in Semi
Inclusive Deep Inelastic Scattering processes, which result in good agreement
with the measurements performed by the HERMES and COMPASS Collaborations.
