ELI5: Explain Like I'm 5

Churchill–Bernstein equation

The Churchill–Bernstein equation is an equation used to help scientists understand how energy works. It says that energy (E) is equal to a number (C) times the square of the speed of light (c) squared. To be more precise, it looks like this:
E = Cc^2
The number c is a very important number because it shows us how fast light travels. If we know how much energy something has, we can use this equation to figure out how fast the light is travelling. It's like a special equation that helps us understand energy from light.