Simon: You can derive the speed of light from Maxwell’s equations.
Me: Because they used to think it was infinite, right?
Simon: Maxwell’s equations aren’t invariant to the Galilean transformation, which means that the Galilean transformation is wrong, which means that Newton’s mechanics is wrong. The actual transformation is the Lorentz transformation, and this is the exciting one. Because that’s what you need for Einstein’s relativity!
Geeks out of the box 