How did Einstein come up with E mc2?

Related questions

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4. Why did Albert Einstein win the Nobel Prize?
5. Did Einstein invent nukes?
6. What does Einstein's equations of general relativity relate to?
7. Why did Einstein invent the atomic bomb?
8. What does E mc2 measure?
9. How long did it take Albert Einstein to create E mc2?
10. How did Einstein derive E MC?

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