Special Relativity Part 4: Mass-Energy Equivalence or E = mc²

Everyone and their mom knows about E = mc^2, it's the most famous equation in science, and there are plenty of posters you can buy for your dorm room with Einstein's face and this equation floating mysteriously around his head. But what does it mean? You'd better know if you're gonna get that poster! What if that cute boy or girl from class comes over and asks you about it and you don't know what you're talking about? That will be super embarrassing. You'd better watch this.

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