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hbrav commented on DOGE Put Critical Social Security Data at Risk, Whistle-Blower Says   nytimes.com/2025/08/26/us... · Posted by u/jbegley
nxobject · 4 days ago
SSA's CIO "accepts all risks" - but what does that actually mean in practice? Is he going to be held accountable?

> The agency’s chief information officer Aram Moghaddassi approved the move to copy the database to the agency’s cloud, saying he “determined the business need is higher than the security risk” and that he accepts “all risks” with the project.

hbrav · 4 days ago
This is one of my pet peeves: people saying they accept risk/responsibility that they don't have the ability to accept.

It's like co-signing a $1M loan when you only have $100 to your name.

hbrav commented on DIY Telescope Mods That Transformed My Astrophotography   youtube.com/watch?v=Efmzr... · Posted by u/karlperera
madaxe_again · a month ago
My first bahtinov mask I just made out of some scrap cardboard - worked a treat.

Now I just use an autofocuser (pegasusastro focuscube), which I find gives identical results, and didn’t cost the world either (€130) - plus has the benefit that as the scope cools down through the night I’m not constantly having to stop imaging to refocus.

hbrav · a month ago
I also did my first one out of cardboard!
hbrav commented on Nearly 3 out of 4 Oracle Java users say they've been audited in the past 3 years   theregister.com/2025/07/1... · Posted by u/rntn
robotnikman · a month ago
I'm reminded again of the meme of the Oracle org chart

https://palisadecompliance.com//wp-content/uploads/2013/11/o...

hbrav · a month ago
Mighty bold of them to assume that most of engineering would be above most of legal.
hbrav commented on Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh   wwwmpa.mpa-garching.mpg.d... · Posted by u/gone35
antognini · 2 months ago
Worth noting that this paper is from 2009.

For anyone interested they released the code about a decade later: https://arepo-code.org/getting-started

hbrav · 2 months ago
> about a decade later

Practically the blink of an eye to a cosmologist!

hbrav commented on Dynamical origin of Theia, the last giant impactor on Earth   arxiv.org/abs/2507.01826... · Posted by u/bikenaga
echelon · 2 months ago
Imagine if life had evolved on Earth or Theia prior to impact. Imagine if it was intelligent and played witness to the giant cataclysm.

Given that intelligence took an awfully long time to emerge from LUCA, that seems implausible. But it's fun to imagine pre-Theia "Silurians". That sort of impact would have scorched earth of any trace or remnant of their existence. It feels as though there must be sufficiently advanced civilizations out there witnessing this exact scenario play out without the necessary technology to stop it. Though that fate would be horrifying.

Another thing to think about is that shortly after the Big Bang (if there was one, Lamda-CDM or similar models holding up), was that shortly after the Big Bang the temperature of the early universe was uniformly 0-100 degrees Celsius. It may have been possible for life to originated in this primordial interstellar medium without even so much as needing a host planet or star! Just life coalescing in space itself.

That early primordial soup, if it existed, could have seeded the whole universe. Most aliens might have matching molecules and chirality if those decisions predate our galaxy.

hbrav · 2 months ago
That second idea (cosmic primordial soup causing universal similarity / compatibility of life) could be a great component of a sci-fi story.
hbrav commented on Brit politicians question Fujitsu's continued role in public sector contracts   theregister.com/2025/06/2... · Posted by u/rntn
hbrav · 2 months ago
This article is a little bizarre, in that it leaves a lot unsaid. On reading it my first thought is "the government could simply forbid its department from considering bids from Fujitsu". This seems like a perfectly reasonable response. The company has shown gross incompetence, coupled with great arrogance. There is every reason to think that it would do so again. Further, being barred from bidding would act as a deterrent to similar behaviour from other companies in future.

I assume there is some reason this cannot be done. Do procurement rules prevent the outright banning of a company from making bids?

hbrav commented on Low-Temperature Additive Manufacturing of Glass   ll.mit.edu/research-and-d... · Posted by u/LorenDB
giantg2 · 2 months ago
Interesting. I wonder if this could be used to print telescope mirrors if you could get an "ink" that has high thermal stability, or if that would be in conflict with the low temperature printing.
hbrav · 2 months ago
That seems like it would be very difficult. For a telescope mirror you want a very good surface finish, and that's one thing that 3D printing does very poorly.
hbrav commented on Honda conducts successful launch and landing of experimental reusable rocket   global.honda/en/topics/20... · Posted by u/LorenDB
tw04 · 2 months ago
> successfully landed its 6.3-metre (20.6-foot) experimental reusable launch vehicle

From another article.

hbrav · 2 months ago
Or in natural units: three very tall men stood on top of one another, wearing a top hat.
hbrav commented on Show HN: Olelo Foil - NACA Airfoil Sim   foil.olelohonua.com/... · Posted by u/rbrownmh
rbrownrw8 · 3 months ago
(and I'll give you my email just want to avoid too much spam)
hbrav · 3 months ago
I've sent you a message.
hbrav commented on Show HN: Olelo Foil - NACA Airfoil Sim   foil.olelohonua.com/... · Posted by u/rbrownmh
hbrav · 3 months ago
I have a background in fluid dynamics and may be interested in helping with this. Is there a way for me to contact you?

u/hbrav

KarmaCake day493February 18, 2021View Original