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Cake day: June 4th, 2023

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  • Tlaloc_Temporal@lemmy.catoScience Memes@mander.xyzOwl Pellets
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    1 day ago

    I think most if not all tetrapods should have the 1-2-3-4-5 hierarchy for their arms and legs (although the later branches often fuse together).

    I just checked, and mice have the 1-2 pattern for front and hind limbs. It’s just the arms that are weird, but this mouse’s arms have always been weird.

    Edit: I just saw the legs again, those are definitely screwed up too.



  • Some cells are getting 47%, which is ridiculous for a generator! The theoretical maximum efficiency for solar cell from the sun as it appears in the sky is about 68%, so that’s pretty good!

    However, how expensive is that cell going to be? How much maintenance does it need, and how fragile is the system once deployed? It’s very obvious that PV efficiency has beed skyrocketing recently, and I don’t thinks it’s stopping soon, but a commercial PV panel available today is just breaking 20% efficiency. Luckily, sunshine is quite abundant.











  • There’s still miles of countryside between cities in the Netherlands, Japan, Switzerland, Germany, and Denmark. Many of Canada’s cities have fantastically walkable neighborhoods and light train services, and Canada has even more unreachable rural areas than the Sates. Urban solutions are almost completely unaffected by the size of the rural areas.

    These solutions can all happen in individual cities and even towns. How many hours of car driving away the next urban center is doesn’t affect where parking is placed, or zoning density, or where the highways are routed, or how fast the busses are, or whether a light train could be viable.




  • Also, the cooling effect sulphate aerosols can cause only really happens at high altitudes. At low altitudes the reflected light is less likely to escape to space, and the aerosols fall out of the air faster.

    Even if they reached high altitudes, one of the effects of being in the atmosphere is moving with the wind, across entire hemispheres. And at tropospheric heights, sulphates, their products, and other byproducts of combustion may destroy ozone at significant levels.

    There may come a day where aerosol-based geo-engineering becomes a part of climate management, but it’s definitely not with bunker fumes.