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"[@Cirrus Light":](/1192510#comment_5191030
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Fun fact; E = mc ^2^ actually comes from the relativistic expression for energy: E = sqrt( p ^2^ c ^2^ + m ^2^ c ^4^ )


 
And p = mv / sqrt( 1 - v ^2^ / c ^2^ )


 
Set v = 0, and the p ^2^ c ^2^ term disappears and you're left with:


 
E = sqrt ( m ^2^ c ^4^ ) = mc ^2^


 
The kinetic energy of an object at rest (velocity, v = 0). Therefore, the "rest energy" of a mass.

~
 
%And after we science I will hug Twi so hard...~ Just look at that serious face. She totally doesn't see it coming...%

"@Cirrus Light":/1192510#comment_5191030
Fun fact; E = mc ^2^ actually comes from the relativistic expression for energy: E = sqrt( p ^2^ c ^2^ + m ^2^ c ^4^ )

And p = mv / sqrt( 1 - v ^2^ / c ^2^ )

Set v = 0, and the p ^2^ c ^2^ term disappears and you're left with:

E = sqrt ( m ^2^ c ^4^ ) = mc ^2^

The kinetic energy of an object at rest (velocity, v = 0). Therefore, the "rest energy" of a mass.

~And after we science I will hug Twi so hard...~

"@Cirrus Light":/1192510#comment_5191030
Fun fact; E = mc ^2^ actually comes from the relativistic expression for energy: E = sqrt( p ^2^ c ^2^ + m ^2^ c ^4^ )

And p = mv / sqrt( 1 - v ^2^ / c ^2^ )

Set v = 0, and the p ^2^ c ^2^ term disappears and you're left with:

E = sqrt ( m ^2^ c ^4^ ) = mc ^2^

The kinetic energy of an object at rest (velocity, v = 0). Therefore, the "rest energy" of a mass.