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Cake day: June 12th, 2023

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  • I took a trip to Norway a year or so ago. I was flying first to Denver, where a friend who lived in Denver would meet me in the airport, and then we’d fly to Munich, and from there to Oslo. That was the plan, anyway.

    Well, when I got to my gate at my local airport, I found that my flight was delayed by a couple of hours. Obviously too much to have any chance of catching my connecting flight.

    I called the airline, and decided to take the flight to Denver that day, and rebook the remaining flights for both me and my friend for the next day, going through Frankfurt instead of Munich. I stayed overnight in Denver, and we set out the next day.

    Aaand of course then the flight out of Denver was delayed, and we missed the flight from Frankfurt to Oslo. We were rebooked onto a flight from Frankfurt to Munch, in order to catch a later flight from Munich to Oslo. Fortunately that one was on time. But then the flight to Oslo was delayed; you know, one for the road, I guess. At that point we were just glad that that delay wouldn’t make us miss another flight.




  • Aperiodic, in this sense, doesn’t mean that there aren’t any bits that repeat. In fact, if you pick any patch of tiles of any arbitrary size, that patch will be repeated infinitely many times. What it means to be aperiodic is that if you slide the whole tiling over so that one of the patches aligns with the repeated bit, there will still be something outside the patch that doesn’t align. Compare that with, say, a repeating grid of squares, where if you slide one square onto a different square then everything lines up, all the way to infinity; it’s impossible to tell that it’s been slid over.







  • This is not the same for all crypto currency, but a bitcoin represents a “proof of work”. When people “mine” bitcoins, they are consuming computational resources, and when they find a bitcoin, it is a certification of the work that was done to find it that becomes the value of the coin. And then, as others as mentioned, people just agree that that work has a certain amount of monetary value. But the proof of work is what limits the supply and allows that value to exist. 3Blue1Brown has a really good video that goes into the technical details if you’re interested.







  • HIPAA allows medical care providers to share your information with each other for the purposes of providing care (whether that sharing happens through MyChart or some other means). It does not require your consent (and this could be a good thing if, for example, you were taken to a hospital while unconscious). You simply may not have a lot of options for preventing this. As NOT_RICK mentioned, you could opt out of Care Everywhere at the psychiatric hospital to prevent them from sharing your information that way. You could also try to amend their record or request that they restrict access to your records, as per https://www.hhs.gov/hipaa/for-professionals/privacy/laws-regulations/index.html#general. All of those options would require interacting with the original psychiatric hospital, so if you’re unwilling to do that, I’m not aware that there are other options available.



  • One of my favorites is the “ladder paradox” in special relativity, although I originally learned is as a pole vaulter rather than a ladder:

    A pole vaulter is running carrying a pole that is 12m long at rest, holding it parallel to the ground. He is running at relativistic speed, such that lengths dilate by 50% (this would be (√3/2)c). And he runs through a barn that is 10m long that has open doors in the front and back.

    Imagine standing inside barn. The pole vaulter is running so fast that the length of the pole, in your frame of reference, has contracted to 6m. So while the pole is entirely inside the barn you press a button the briefly closes the doors, so that for just a moment the pole is entirely closed inside the barn.

    The question is, what does the pole vaulter see? For him, the pole has not contracted; instead the barn has. He’s running with a 12m pole through what, in his frame of reference, is a 5m barn. What happens when the doors shut? How can both the doors shut?

    I will admit that I have never used this thought experiment for any practical end.