On Wed, Jun 8, 2016 at 8:04 AM, spudboy100 via Everything List <
[email protected]> wrote:

​> ​
> How do we define matter, and how do we define energy.


​If it has no rest mass then it's matter. If it's moving through a vacuum
at the speed of light then it's energy. If the thing with non-zero rest
mass is moving but at less than the speed of light then you've got both
matter and energy.

 John K Clark

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