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Joined 7 months ago
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Cake day: December 9th, 2023

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  • Something that definitely separates me from some of my less experienced coworkers is that, when I sit down and start to implement a plan I came up with in my head, if it turns out that things start exploding in complexity then I reevaluate my plan and see if I can find a simpler approach. By contrast, my less experienced coworkers buckle down and do whatever it takes to follow through on their plan, as if it has now become a test of their programming skills. This makes life not only more difficult for them but also for everyone who has to read their code later because their code is so hard to follow.

    I try to push back against this when I can, but I do not have the time and energy to be constantly fighting against this tendency so I have to pick my battles. Part of the problem is that often when the code comes to me in a merge request it is essentially too late because it would have to be essentially completely rewritten with a different design in order to make it simpler. Worse, the “less experienced” coworker is often someone who is both about a decade older than me and has also been on the project longer than me, so even though I technically at this point have seniority over them in the hierarchy I find it really awkward to actually exercise this power. In practice what has happened is that they have been confined to working on a corner of the project where they can still do a lot of good without others having to understand the code that they produce. It helps that, as critical as I am being of this coworker, they are a huge believer in testing, so I am actually very confident that the code they are producing has the correct behavior, even when I cannot follow the details of how it works that well.







  • The difference is that aether unraveled pretty quickly when we started seriously looking for it because experiments kept being outright inconsistent with what it was predicted we would see if it were there, whereas there are lots of independent lines of evidence that all point to the dark matter existing in the same page, so it really is not the same situation at all. The only problem with dark matter is that it doesn’t show up in our particle detectors (so far, at least), but there is no law of the universe that says that everything that exists has to.


  • It helps to realize that mass is just a bookkeeping label that we assign to the “internal” energy of a system, where the choice of what counts as being “internal” is somewhat arbitrary and depends on the level we are studying.

    For example, if you measure the mass of the nucleus of some atom, and then compare your measurement to the sums of the masses of the protons and neutrons inside of it, then you will see that the numbers do not agree. The reason for this is that much of the mass of a nucleus is actually the energy of the strong force bonds holding the nucleons together.

    But you can actually drop down another level. It turns out that the vast (~ 99%) majority of the mass in the proton in turn does not come from the quarks but from the energy of the gluon field holding them together.

    And if you drop down yet another level, the quarks get their mass through their interactions with the Highs field.

    So in short, it is energy all the way down.












  • Yes. My rule of thumb is that generally rebasing is the better approach, in part because if your commit history is relatively clean then it is easier to merge in changes one commit at a time than all at once. However, sometimes so much has changed that replaying your commits puts you in the position of having to solve so many problems that it is more trouble than it is worth, in which case you should feel no qualms about aborting the rebase (git rebase --abort) and using a merge instead.