[ETL]

And most of all, we still don’t know what energy is.

e=mc^2

Hope this helps.

Seriously, we do know that its carrier 'particle' is the photon, one of the many bizarre entities of the quantum realm which can behave as both a particle and wave phenomenon at the same time. That is, until someone or thing? 'looks' at it. Then it becomes 'real', whatever that means.

[TexasGator]

but NOT at the same rime.

[reasonisfaith]

No.

The equation you posted gives as much information about what energy is as the sentence “Is is to be” gives about being.

We don’t know what energy is.