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Cake day: July 2nd, 2023

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  • PumpkinSkink@lemmy.worldto196@lemmy.blahaj.zoneRule
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    2 months ago

    I think the thing to keep in mind here is that those midrise mixed use buildings are housing, and can help the housing supply issue. The issue with them is often that wealthier neighborhoods and suburbs resist them so much that they end up being new expensive housing in the areas that were already doing the heavy lifting housing supply-wise.

    Near where I live there is an estimated housing supply deficit of literally several hundred thousand units. My city, a medium city in the Metropolitan area of a big city, has built more than 50 of these buildings in the last decade, but wealthier suburbs a little farther out have gone to absurd lengths to prevent more than one or two token multi-family units from being built in them. The metro area cities, who’s inhabitants feel the rise in housing price most sharply, cannot possibly build hundreds of thousands of units, there needs to also be significant building in suburban areas nearby if we want to hit that number and move the needle on housing.

    tldr: Those housing units are fine, we just need to get wealthier less densely developed suburbs to build them too. Oh and build a fucking train station there while you’re at it.


  • There’s good reason to presume carbon is required. Carbon has some nice, and totally unique properties that allow it to facilitate life.

    The most important features to carbon in this context are:

    1. Stable catenation of atoms. Carbon atoms can bond to other carbon atoms in a long chain, and that chain does not become appreciably more reactive. This allows for the construction of very large molecules with specialized mechanical functions.

    2. Ability to form stable multiple bonds. Carbon can form single, double, or triple bonds with itself (and oxygen and nitrogen), which allows carbon-based molecules to have ridgid shapes. Double bonds are found all over the place in life because they allow molecules to have sections that aren’t just wiggly noodles of atoms.

    3. Bond stabilities that fall in a kind of “goldilocks zone” where carbon bonds to other atoms are strong enough to resist falling apart, but weak enough to be broken later.

    4. Nearly identical electronegativity to hydrogen. Carbon pulls on the electrons in its bonds about the same amount as hydrogen. This allows it to make stable bonds that are non-polar, which, when used in conjuction with other, more electronegative atoms (particularly oxygen and phosphorus) allow Carbon-containing molecules to be hydrophobic, hydrophilic, or both simultaneously. This property is what allows for complex structures like Lipid bilayers and proteins to be formed.

    No other atom, not even silicon, has this set of properties, and it’s very hard to imagine how you would make all but the most simplistic verson of life without these.


  • I mean, I can agree that simple autocatalytic reactions can occur with chemistry based on other elements… but it’s a stretch to say that suggests “alien life might not be carbon-based”. Maybe very, very simple, life-like chemical systems, but life as we know it is defined by large, many-atom molecules, and no other element can do this the the way carbon can (not even silicon, whose bond energy decreases with catentation of more silicon atoms link, which, combined with it’s poor ability to form multiple bonds ruins the possibility of silicon-based life). Anything that we can conceivably think of as “life” beyond simple self-reproducing chemical, or bizzare Boltzmann brain-esque systems will have carbon-based chemicals in it.