  New experimental and theoretical results obtained in 2021 made it acutely
clear that more than 80 years after the discovery of nuclear fission we do not
understand the generation and dynamics of fission fragment (FF) intrinsic spins
well, in particular their magnitudes, their spatial orientation, and their
correlations. The magnitude and orientation of the primary FFs have a crucial
role in defining the angular distribution and correlation between the emitted
prompt neutrons, and subsequent emission of statistical (predominantly E1) and
stretched E2 {\gamma}-rays, and their correlations with the final fission
fragments. Here we present detailed microscopic evaluations of the FF intrinsic
spins, for both even- and odd-mass FFs, and of their spatial correlations.
These point to a well-defined 3D FF intrinsic spin dynamics, characteristics
absent in semi-phenomenological studies, due to the presence of the twisting
spin modes, which artificially were suppressed in semi-phenomenological
studies.
