A detail on the original question. Because the formula is E=mc^2, a small amount of matter makes a lot of energy (e.g., nuclear bombs), but a lot of energy makes a rather small amount of mass. Thus, the energy to matter change tends to be rather harder to measure and show impressively. As has already been pointed out, energy to mass conversion is measurably present in particle accelerator experiments - it is possible to measure, but it’s generally tiny.
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