Add the tennis racket theorem(Intermediate axis theorem)

For rigid bodies,stable around the axis with the smallest and largest rotational inertia(1st axis and 3rd axis),but it is unstable around the intermediate axis.(2nd axis)
For soft body,only around the axis with the largest rotational inertia is it stable(3rd axis),unstable around other axes(1st axis and 2nd axis),because of energy dissipation(Fuel tank filled with liquid)