Most people, even those who haven't taken physics, are in love with E=mc2, the equation of mass-energy equivalence that was created/discovered by famous scientist Albert Einstein. This equation relates mass and energy in a beautiful way!
However, Einstein's equation is only E=mc2 when the mass is not moving at all; see, there is a momentum (p) that must be taken into account otherwise! The full equation is E2 = (mc2)2 * (pc)2!
More information is in this MinutePhysics video!
Soldiers, exactly at three o'clock, the enemy is to be crushed by your fierce charge, destroyed by your grenades and bayonets. The honor of Belgrade, our capital, must not be stained. Soldiers! Heroes! The supreme command has erased our regiment from its records. Our regiment has been sacrificed for the honor of Belgrade and the Fatherland. Therefore, you no longer need to worry about your lives: they no longer exist. So, forward to glory! For the King and the Fatherland! Long live the King, Long live Belgrade!