How did Einstein derive E mc2?

Related questions

1. How old was Einstein when he discovered e mc2?
2. What is the formula of Einstein?
3. Why was Hiroshima chosen as the site for the atomic bombing?
4. Has E mc2 been proven?
5. How did Einstein come up with E mc2?
6. Can mass be converted to energy?
7. How did Einstein predict black holes?
8. Who invented the nuke?
9. Did Einstein invent nukes?
10. Why did Albert Einstein win the Nobel Prize?

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16. #relativity
17. #proved
18. #deriving