mc ☕ @mc@qoto.org

Climate startup Make Sunsets releases toxic chemicals into the atmosphere to block the sun, alarming scientists
https://techstartups.com/2022/12/28/climate-startup-make-sunsets-releases-toxic-chemicals-atmosphere-block-sun-alarming-scientists/

> #injecting large amounts of #particles into the #atmosphere would not undo the effects of increasing carbon dioxide levels, but rather create #another #climate scenario. It might bring down temperatures but would not, eg, reduce ocean acidification. The #consequences for precipitation and wind patterns are #unknown.
> There are currently #nolaws or treaties that #regulate weather #modification or #climate #engineering and I’m afraid we will in the future see more companies doing this.
--Sabine Hossenfelder

> One of the central problems in fluid dynamics is to figure out if the [Euler] equations ever fail, outputting nonsensical values that render them unable to predict a fluid’s future states.
> Mathematicians have long suspected that there exist initial conditions that cause the equations to break down. But they haven’t been able to prove it.
> In a preprint posted online last month, a pair of mathematicians has shown that a particular version of the Euler equations does indeed sometimes fail.
...
> Perhaps in some situations, the equations will proceed as expected, producing precise values for the state of the fluid at any given moment, only for one of those values to suddenly skyrocket to infinity. At that point, the Euler equations are said to give rise to a “singularity” — or, more dramatically, to “blow up.”
> Once they hit that singularity, the equations will no longer be able to compute the fluid’s flow.
...

Computer Proof ‘Blows Up’ Centuries-Old Fluid Equations
https://www.quantamagazine.org/computer-helps-prove-long-sought-fluid-equation-singularity-20221116/

Very important and interesting work, if you're a mathematician, a physicist or an engineer that has ever 'crashed' with Euler/Navier-Stokes equations.

#math #physics #fluids #euler #navierstokes #equations #singularities

People who put Dr. before their nick are incorrigible jokers.
People who put Dr. before their name are incorrigible insecure.

#humor #humour #nick #jocker #name #insecure

> O come, Thou Key of David, come,
And open wide our heavenly home;
Make safe the way that leads on high,
And close the path to misery.
...

O Come, O Come Emmanuel | Joy to the World | Fountainview Academy
https://invidious.snopyta.org/e3wooDhJmvw?t=171

#music #Emmanuel #true #Christmas #song

> The Consolation of Haldane depends, though, on what kind of universe we live in, and maybe on such arcana as whether there's enough matter eventually to reverse the expansion of the universe, and the character of vacuum fluctuations. Those with a deep longing for life after death might, it seems, devote themselves to cosmology, quantum gravity, elementary particle physics, and, especially, transfinite arithmetic.

-- Carl Sagan, Demon Haunted World

Sagan does not agree with Haldane, but I think "why not?"

#carlsagan #book #demonhauntedworld #thoughts #mythought