Why is energy

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Why is energy equal to mass times the speed of light squared
https://why-is.org/energy/equal-to-mass-times-the-speed-of-light-squared/
Why is energy conservation important in healthcare
https://why-is.org/energy/conservation-important-in-healthcare/
Why is energy transfer not 100 efficient
https://why-is.org/energy/transfer-not-100-efficient/