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I've been trying to learn how light "speed" found its way into relativity. Doing a bit of Googling, I found a Wiki reference that says Newton suggested that light and matter are interchangeable. As a layman, I can sort of understand how that could be, but not how light "speed" impacts on that. Somewhat like F=ma (or F=mv

^{2}), if I understood how light speed fits into the picture, I can then vaguely understand why E=mc

^{2}works. Am I right in seeing F=mv

^{2}as analogous to E=mc

^{2}?

The history of such discoveries fascinates me. I'm slowly getting some of the math, but even the basics of many relativity equations still eludes me. Be patient with me.. ;)