It’s the drug baggy pocket.

Assuming vacuum but still writing c instead of c_0? And what did D and H ever do to you to deserve this treatment? I feel sick

I keep a boxcutter, pry bar, and a pair of tweezers in mine. I keeps maxwell’s equations in my inner coat pocket.

https://en.wikipedia.org/wiki/Maxwell's_equations

Woah, hold on there, that is way too much equations for such a small pocket. Surely they must first be put in the differential form notation.

Let me try

I completely failed that course. I don’t know what they mean or how to use them.

I never needed them. Guess it’s “when will we ever use geometry in real life” but with EM fields and waves.

Or key fobs

That short notation is an abominable lie!

And here I was using it for my Zippo lighter.

A fool I was.