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Someone told me "energy cannot be destroyed or created". what about the nuclear power? It changes mass to energy.

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Yes it changes mass to energy. Mass and energy can be converted to each other, but no energy is lost or created

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thanks so much for your ans :)
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I enjoyed you que :)
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every thing has some kind of energy ,,and energy can be converted from one type to another or can be transfered
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Nuclear power does not change mass to energy. The energy is in the mass. Nuclear power is created when the energy in the mass is released,due to the atoms of mass being fused together by heat and pressure, or when atoms are split by being slammed together at very high velocity. Actually, energy and mass are basically the same thing. That's the meaning of E=(MC)2

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This is incorrect. Matter is converted to energy in a fusion reaction. Mass is lost and energy is created. THAT's the meaning of E=MC^2.
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Energy is not created, it was always there, it is released in the form of heat and light.
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I explained it wrong, mass is lost, when converted to energy, but mass and energy being different forms of the same thing, means that no energy is created.it still holds true that energy cannot be created.
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so is there any difference between energy and power? and can you briefly further explain what mean by "energy and mass are actually the same thing, that's the true meaning of E=mc^2" thanks :)
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It says it in the equation, energy equals mass. The times the speed of light squared, just refers to the amount of energy stored in an object of mass at rest. If energy equals mass, then mass has to equal energy, when either one is converted to the other , it takes another form, but never becomes something different.

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