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# E = mc2

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It was originally m = E / c2

A consequence of it, and the theory of relativity, is that any object is more than the sum of its parts. An object's internal and potential non-mass energy is also a measurable part of it in form of weight.
The sun would still lose several kilograms of weight every second, even if it never lost a single atom. If you put a flashlight into a box, with mirrors on its interior walls, it weighs slightly more than if you open the box.

(If you're not familiar with PBS SpaceTime, you better buckle up and keep your finger by the pause button. They do not waste time.)

The same could be said about the brain. The combined neuron energy of our memories, thoughts, feelings, fantasies and dreams literally carries weight. We could even go as far as calling it a soul, in lack of a better word, because it makes us who we are. A soul, however, than does not survive death.

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6 minutes ago, zep73 said:

It was originally m = E / c2

There's nothing funny about that, it's exactly the same equation just expressed differently, in the same way that 12=3*22 is the same equation as 3=12/22. It's basic algebra, the equation has simply been rearranged to find E instead of m. You could also express it as c2=E/m (or 22=12/3 in my numeric version), It is still the same equation

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4 minutes ago, Waspie_Dwarf said:

There's nothing funny about that, it's exactly the same equation just expressed differently, in the same way that 12=3*22 is the same equation as 3=12/22. It's basic algebra, the equation has simply been rearranged to find E instead of m. You could also express it as c2=E/m (or 22=12/3 in my numeric version), It is still the same equation

Well I find it a bit funny, that it was originally formulated differently, and so does the PBS SpaceTiime guys.