Today: a physics lesson.

In quantum mechanics, the zero-point energy is the energy of the ground state of a system.  Interestingly, this energy is not zero.  For example, in the case of a simple molecule with two atoms, these atoms never cease vibrating back and forth – i.e. they always have energy.

Why do I bring this up on a Sunday morning?

Because children are like this.

Even in the middle of the night, when they are sleeping in your bed because they had a bad dream, they still squirm.  They never stop squirming.

Not that I’ve had any experience with that in the last few hours…

I wonder – at what age do we learn to hold still?