You no doubt heard about this fellow in the last week with the steampunk rocket with "Flat Earth Research" written on the side. In my opinion, he was pretty clearly trolling the media; not much likelihood of resolving any issues about the shape of the Earth if the peak altitude of your rocket is only [...]

## E=mc^2

Derived in ten minutes while I was on the toilet: Edit: 11-16-16 There was a slight error in the set-up of the center of mass calculation. Light appears to move an effective mass from -L/2 to L/2-l, the starting and stopping points of light. Here's the reformulation to capture that. Time spent on this derivation: [...]

## Interaction Picture

It's not always about the cat. Here, I will show how to hop from the time dependent Schrodinger equation to the Interaction picture form. This post is intended to help recover a tiny fraction of the since-destroyed post I originally entitled "NMR and Spin Flipping part II." I have every intention to reconstruct that post [...]

## Magnets, how do they work? (part 2)

I will talk about the origin of the magnetic dipole construct here. Consider a loop of wire... You may have noticed that I posted an entry entitled "NMR and Spin flipping (part 2)" which has since disappeared. It turns out that wordpress doesn't synch so well between its mobile app and its main page: I [...]

## Chemical Orbitals from Eigenstates

A small puzzle I recently set for myself was finding out how the hydrogenic orbital eigenstates give rise to the S- P- D- and F- orbitals in chemistry (and where s, p, d and f came from). The reason this puzzle is important to me is that many of my interests sort of straddle how [...]

## Powerball Probabilities

If you've read anything else in this blog, you'll know I write frequently about my playing around with Quantum Mechanics. As a digression away from a natural system that is all about probabilities, an interesting little toy problem I decided to tackle is figuring out how the "win" probabilities are determined in the lottery game [...]

## Parity symmetry in Quantum Mechanics

I haven't written about my problem play for a while. Since last I wrote about rotational problems, I've gone through the entire Sakurai chapter 4, which is an introduction to symmetry. At the moment, I'm reading Chapter 5 while still thinking about some of the last few problems in Chapter 4. I admit that I [...]

## Magnets, how do they work? (part 1)

Subtitle: Basic derivation of Ampere's Law from the Biot-Savart equation. Know your meme. It's been a while since this became a thing, but I think it's actually a really good question. Truly, the original meme exploded from an unlikely source who wanted to relish in appreciating those things that seem magical without really appreciating how [...]

## Revoke Shaquille’s Doctorate in Education… he doesn’t deserve it.

We are in a world where truth doesn't matter. Read this and weep. These men are apparently the authorities of truth in our world. Everywhere you look, truth itself is under assault. It doesn't really matter whether you believe, it really doesn't matter what you want it to say. Truth is not beholden to human [...]

## Nuclear Toxins

A physicist from Lawrence Livermore Labs has been restoring old nuclear bomb detonation footage. This seems to me to be an incredibly valuable task because all of the original footage was shot on film, which is currently in the process of decaying and falling apart. There have been no open air nuclear bomb detonations on [...]