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e = mc²

mass · energy · equivalence
Drop a rock, and it just sits there — solid, obviously separate from energy like light or heat. Einstein's famous equation says that split is an illusion: mass and energy are the same thing in two different forms, converting into each other at a fixed, measurable rate. The sun loses about four million tonnes of mass every second, turning it into the sunlight reaching Earth eight minutes later; nuclear plants turn a sliver of uranium's mass into electricity the same way. Convert one gram of matter — about a paperclip's weight — completely into energy, and you'd get roughly enough to power 2,500 American homes for a year. That's a fixed physical exchange rate, not a metaphor for "raising your energy" or manifesting.