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Cake day: July 20th, 2023

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  • https://www.planetary.org/articles/why-international-space-station-cant-operate-forever

    The ISS has gone through multiple reboosts to gain altitude because there is a small amount of atmospheric drag in its orbit. That’s not the limiting factor though.

    The structure is aluminum. Aluminum accumulates fatigue damage every time it flexes. Every time the iss goes from sunlight to the earths shadow, there is significant thermal expansion/contraction. This fatigues the structure. The repeated docking maneuvers also stress the structure. Radiation and atomic oxygen also cause degredation. All those factors are relatively minor in any given year, but are always accumulating. The ISS is getting less safe and the risk of a structural failure is increasing.

    On top of that all, a bunch of the systems on board were designed 30 years ago. There have been major changes in communications, power systems, etc. in the time since the modules were built. Even though new experiments are built all the time, they are still constrained by capabilities of the capsules they operate in. So there are also science advantages to moving to a newer platform.









  • I don’t think limiting density would control bird flu specifically considering that wild bird populations are high enough density to spread this disease.

    I do generally support lower density farming though. Anecdotally, the white blood cell count of dairy cows on pasture is way lower than when they are in barns during the winter. And even the winter white blood cell counts on the small organic dairy farm I worked on was an order of magnitude lower than what is considered normal for conventional dairy.

    White blood cell counts in milk are used as a proxy to monitor for infections. It’s impractical to test for every pathogen, but looking for the immune response of the cow works reasonably well.



  • My wife worked for a company that was heavily reliant on generating leads from ads. They had lots of real time monitoring of conversion rates to make sure they were actually making more money than they were spending on the ads. They would have to turn ad channels off all the time because the return on ad spend went negative.

    So my conclusion is that ads can be somewhat effective for companies, but if they don’t actively monitor and control the performance of their ads, they’re probably just burning money. A lot of companies seem to advertise because they think that’s the only way to grow.