An extremely useful concept for car enthusiasts is mass moment of inertia which represents the distance of an object's center of mass from a rotational axis. - European Car Magazine ...

This is just a measure of how fast the object is spinning. But what about the moment of inertia? It might make more sense to also call this the rotational mass.

The phenomenon is not abnormal — a shift in any object’s mass on earth relative to the axis of rotation will change a moment of inertia, though most are too small to be measured. Earth’s ...

So, 3D printing corneas could potentially help a lot of people. The most difficult part of the process was making the bio-ink--the solution that can be printed.