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Originally Posted by Og  Energy and mass are both PROPERTIES of matter. They are not physical things... Matter itself is the physical thing. |
I guess you're right. But chemical energy, whether it is in a battery or in your brain, is quantifiable just like photons or electrons, and therefore are also "physical things". It's just that matter (made of atoms) is a "physical thing" that exists in a different state than photons or electrons which are also physical things.
This is my understanding of it, but I didn't want to turn this into a debate about quantum physics. I just like the concept that ideas are physical things.