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Gravityloss

6,614 karmajoined 15 years ago

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New UK stealth fighter demonstrator takes shape

aerosociety.com
4 points·by Gravityloss·13 days ago·0 comments

Sweden's Vattenfall picks Rolls-Royce SMR for nuclear power project

reuters.com
1 points·by Gravityloss·23 days ago·0 comments

Maxime Guillaume patented the axial turbojet in 1921

en.wikipedia.org
4 points·by Gravityloss·last month·0 comments

Terafab, Data centers in space, simple orders of magnitude analysis

gravityloss.com
1 points·by Gravityloss·4 months ago·0 comments

Show HN: Musical Interval Trainer

valtterimaja.github.io
22 points·by Gravityloss·5 months ago·13 comments

European Processor Initiative

european-processor-initiative.eu
3 points·by Gravityloss·5 months ago·0 comments

Climate Solutions: Why I'm More Optimistic for 2026

gravityloss.com
2 points·by Gravityloss·6 months ago·1 comments

Aircraft sometimes rhyme with previous design

gravityloss.com
3 points·by Gravityloss·6 months ago·0 comments

Trofim Lysenko

en.wikipedia.org
4 points·by Gravityloss·7 months ago·1 comments

Freedom Index by Country 2025

worldpopulationreview.com
2 points·by Gravityloss·10 months ago·0 comments

comments

Gravityloss
·yesterday·discuss
One can try putting themselves sometimes in the position of an old person. Let's say you have a heavy steel rollator with grocery bags hanging from the handles. You've spent an hour going to the store in the summer heat and are quite exhausted. Now try to enter your building. There's locked door that needs to be held open, and two thresholds, one for the platform in front of the door and one for the door. You can't go over the first threshold with your rollator as that would prevent the door from being opened.

Now, I think the assumed way to get in is to keep the door open with your body while simultaneously lifting the rollator over both thresholds. This requires considerable strength, as you have to reach far with a heavy weight. Maybe an athlete could do it. Not an old exhausted person.

An old person needs to first leave the rollator out, open the door and make it so it stays open with a hook. Involves crouching and working with your hands close to the ground. Then lift the rollator one by one over the steps and go inside. Then come back out and close the door.

A foot operated door stopper and a few slopes could probably ease that up tremendously.
Gravityloss
·5 days ago·discuss
True! One can walk around and then observe some of the shape. They were behind glass. So no touching, which means there was some unresolved ambiguity.
Gravityloss
·5 days ago·discuss
I saw a few of these black Anish Kapoor sculptures. The experience was worth the cost. The brain has a hard time processing it.
Gravityloss
·5 days ago·discuss
[dead]
Gravityloss
·5 days ago·discuss
I think it's an accurate description of a common way of thinking, though I wouldn't call it conservative in the global sense.

Another is some of the domestic manufacturing or hard tech movement people who present lofty ideals about jobs and sovereignty and so on. But there's a claim that when the surface is scratched a bit, it devolves into a want to keep their imported cheap input materials tax / toll free while introducing taxes and tolls to their foreign competitors' end products. I mean who would pay for domestic materials, they're much more expensive, there'd be no margin!
Gravityloss
·15 days ago·discuss
It still seems to me designing applications or web services is so hard that it's just easier to hire thousands of people to do customer service and having people to come physically to do things. The average corporation's business application or web page is absolutely terrible and a lot of non-technical users simply can not do business with it. Ie it is a hindrance for the businesses core reason of existence. Do the QR code things show up in revenue tracking? Do they do A/B testing? I think I prefer to choose another restaurant if I see that, or not come again.

I think some small pizza shops have had proper simple web pages, probably because it's do-or-die for them and the person contracting the web page is the person also knowing very well how the business is doing. Also phone interactions are very fast and straightforward. It's sad to see them having to struggle with terrible card payment terminals and everybody trying to take a cut (credit card and delivery companies).
Gravityloss
·16 days ago·discuss
A physicist can fill in but there might be some stuff made out of subatomic particles for example.

https://en.wikipedia.org/wiki/Exotic_matter
Gravityloss
·last month·discuss
I see two really good ideas for monetizing the free tier for consumers.

Firstly, if the user is asking for things where AI can link to products or services to buy, there's a very good relevancy, much higher than in other types of ads.

Secondly, since the AI often takes time to compute answers to user's questions, they could be shown ads while waiting. People could perhaps be less annoyed by this than some other commercials since they know the break has to be there anyway.

(First idea is something I came up when asking Claude to compare some products, or ask for help in lawn care. Second idea was by a colleague.)
Gravityloss
·2 months ago·discuss
Ramjets were developed right after the second world war and Mach 4+ was reached in the fifites. It's complicated but not extremely. See Antonio Ferri or Lockheed X-7.

It turned out out solid fuel rockets are operationally more practical for the use cases like air defence, long range missiles that are ballistic instead of cruising in the atmosphere and so on. And jet engines are more efficient for subsonic cruise missiles. Ramjets are still used in some missiles like the long range mach 3 air-to-air Meteor.
Gravityloss
·2 months ago·discuss
Me-109 was similar
Gravityloss
·2 months ago·discuss
But they travel at 8 km/s so actually that cancels benefits? EDIT: checked, not enough to cancel them completely.
Gravityloss
·2 months ago·discuss
Hmm one would expect heat expansion to change the length of fiber over tens of kilometers. Does it also affect light speed in the fiber? I think consumer fiber is not buried very deep on average, but maybe for these use cases you use something hefty anyway.
Gravityloss
·2 months ago·discuss
I think there's also some exaggerations about the differing highway landing capabilities of various aircraft. [1] is a video showing Eurofighter, F/A-18 and F-35 all landing on a highway in an exercise. Capability with stores and fuel load is another thing but I've read material that doesn't find the contemporary aircraft drastically different in that regard. Now, maintenance hours per flight hour and general operability certainly are interesting topics and there could be large differences.

1: https://www.youtube.com/watch?v=kKbgtixpfIc
Gravityloss
·2 months ago·discuss
As a native non Indo European language speaker, aware of the many differences to Indo European languages, it is noteworthy that this however is similar in both. Oikea ja vasen, right and left. Oikea ja väärä, right and wrong.

In clothing you have the right side and the reverse side while here it's oikea ja nurja. Again similarities but nurja has this twisted and dark connotation. Or upside down = nurinperin.
Gravityloss
·2 months ago·discuss
Does anyone know if there's ever been any sort of proper retrospective why the forestry policies of many countries have been so disruptive. Ie supposedly the most organized, high trust, low corruption and scientific societies in the world like Finland and Japan have done some very drastic and unnatural forestry measures that cause effects to this day. It is different than some countries where rampant illegal logging has just destroyed the land, sure. But it's been terrible in other ways. Destruction of biodiversity, destruction of water. In Finland at least the policies have been absolutely forced by law and have sent people to prison and mental institutions. And the land and future generations will suffer for a thousand years. And now some of the policies have been completely reversed - as if nothing had happened. It's this completely parallel bizarre world.

Could we at least look at these tragedies honestly and openly, and learn something from them.
Gravityloss
·2 months ago·discuss
Most common video seems to be a balloon filmed sideways from a fast flying aircraft, with parallax giving the illusion that the balloon moves very fast.
Gravityloss
·2 months ago·discuss
I bet some individuals would bring back smoking in submarines in a heartbeat, if offered suitable sponsoring...
Gravityloss
·2 months ago·discuss
I think it's useful to look at the whole, but also Europe is not very monolithic. One can also look at regions, especially per capita.

One nice page: https://ec.europa.eu/eurostat/web/interactive-publications/r...
Gravityloss
·2 months ago·discuss
Yes, sorry, my criticism was meant to be directed at Burke, since the thermos comment has always bothered me.

You're correct about payload fairing. Also, Space Shuttle External Tank was spray foamed, causing the Columbia disaster when a piece of foam from the tank with hit the wing leading edge. I was googling for what the final verdict was but couldn't easily find an answer. Nice summary in [1]. Cryogenics are complicated.

1:https://idlewords.com/2003/08/things_i_have_learned_about_fo...
Gravityloss
·2 months ago·discuss
Actually... Rockets don't use thermos bottle tanks. Having two surfaces with a vacuum in between, like in a thermos bottle, would be way too heavy. That's why you see these chunks of ice falling at liftoff from cryogenic rockets.

Centaur has balloon tanks which is just very thin metal. It can't even stand on its own without pressure. But no thermos.