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That's the law of "Conservation of Energy". It says you always end up with the

exact same amount of energy you started out with.

That law has been updated a bit in recent years. There used to be two separate

conservation laws ... one for energy and another one for mass, and they both said

that it couldn't be created or destroyed. Scientists were very worried when they did

some very important experiments, and they saw mass being destroyed and energy

being created! Digging in further, they discovered that energy could change into mass,

and mass could change into energy. That discovery actually made things simpler, because

now, instead of two conservation laws, we only need one. It says that mass and energy

can change from one to the other, but whatever the total (mass + energy) is at the

beginning, the total (mass + energy) must be the same at the end.

But how can you add them up ? How much energy makes how much mass ??

And how much mass makes how much energy ???

We're so happy you asked that.

Maybe you've heard that [ E = M c2 ] .

That's the answer to that one.

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14y ago

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