  The internal total-energy of the black-body is a physical quantity of
paramount importance in the development of modern physics. Accordingly,
together with a brief historical development, we report and comment last
breaking news (2018-2024) concerning the definition and properties of this
quantity. The first comment concerns with the inclusion of the Casimir energy
that avoids the vacuum catastrophe implied by he presence of zero-point energy,
thus leading to further quantum contributions associated with boundary effects.
The second comment concerns with a semi-classical simulation of a one
dimensional black-body whose results suggest a possible reconsideration on the
role of classical physics on the quantum black-body.
