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Cake day: May 29th, 2024

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  • Cities with a lot of impermeable surfaces are basically artificial slot canyons.

    When it rains in a forest millions of tons of cool thermal mass is stored in the ground, and when the sun shines all of that mass has to be heated up in order to raise the temperature. Evapotranspiration from trees and other plants provides further cooling using that same water.

    In a slot canyon or impermeable urban environment the water quickly runs off into rivers, with none of it (or very little of it) being retained. This has the duel effect of causing flash floods when it rains (as water rushes down the channels instead of being absorbed over a wide area) and a hot microclimate when its not.



  • For awhile now I’ve been thinking about how nice it would be to have a something like a modern version of the Poqet PC.

    The Poqet PC had a much nicer keyboard than the laptop in the article, and between the simplicity of its software and a very aggressive power management strategy (it actually paused the CPU between keystrokes) it could last for weeks to months on two AA batteries.

    Imagine a modern device with the same design sensibilities. Instead of an LCD screen you could use e-ink. For both power efficiency, and because the e-ink wouldn’t be well suited to full motion video, the user interface could be text/keyboard based (though you could still have it display static images). Instead of the 8088 CPU you could use something like an ARM Cortex M0+, which would give you roughly the same amount of power as a 486 for less than 1/100th the wattage of the 8088. Instead of the AAs you could use sodium ion or lithium titanate cells for their wide temperature range and high cycle life (and although these chemistries have a lower energy density than lithium ion, they’d probably still give you more capacity than the AAs, especially if you used prismatic cells). With such a miniscule power consumption you could keep a device like that charged with a solar panel built into the case.

    Such a device would have very little computing power compared to even a smartphone, but it could still be useful for a lot of things. Besides things like text editors or spreadsheets, you could replicate the functionality of the Wiki Reader and the Cybiko (imagine something like the Cybiko with LoRaWAN). You could maybe even keep a copy of Open Street Map on there, though I don’t know how computationally expensive parsing its data format and displaying a map segment is.









  • That sounds absolutely fine to me.

    Compared to an NVME SSD, which is what I have my OS and software installed on, every spinning disk drive is glacially slow. So it really doesn’t make much of a difference if my archive drive is a little bit slower at random R/W than it otherwise would be.

    In fact I wish tape drives weren’t so expensive because I’m pretty sure I’d rather have one of those.

    If you need high R/W performance and huge capacity at the same time (like for editing gigantic high resolution videos) you probably want some kind of RAID array.