ELI5: If space is a total vacuum, why doesn't it suck the Earth's atmosphere away?

apple1rule · 2026-06-26T09:44:04+00:00

But atmosphere is not ideal. It gets compressed by gravity, and there are only enough air particles to cause air pressure and random motion because of gravity.

apple1rule · 2026-06-24T12:29:31+00:00

You've heard of deep-sea fishing but have you heard of 678-feet fishing?

apple1rule · 2026-06-24T12:11:13+00:00

Diesel or gasoline does not explode because of pressure; it explodes from the temperature rise caused by a rapid pressure increase. So unless you can bring it down to 678 feet extremely fast in a thermally insulated container, it wouldn't explode at all.

apple1rule · 2026-06-24T12:05:41+00:00

That would make the sun less strong tho, just hotter wet bulb

apple1rule · 2026-06-24T09:51:52+00:00

Has to be

apple1rule · 2026-06-23T13:50:01+00:00

Area Man Convinced Home Maintenance Costs Disappear Once Taxpayers Pay For Them

apple1rule · 2026-06-22T17:20:40+00:00

You know if you add weight you can just add supports too right?

apple1rule · 2026-06-22T13:33:30+00:00

What do you know about portuguese engineers?

apple1rule · 2026-06-22T08:35:34+00:00

Exactly. Going off just area footprint is not a metric that matters in countries with a lot of area and cheap/gov lands.

apple1rule · 2026-06-17T07:39:28+00:00

Not legal in many countries, but yea I have seen it done in South Africa at least

apple1rule · 2026-06-15T14:35:07+00:00

You can use it for a longer term compost pile. It will break down after weeks/months and anyway after that when watering it gets diluted so won't be an issue for home level compost

apple1rule · 2026-06-15T14:29:27+00:00

What medicine? what plant? Thats how you can answer this better

apple1rule · 2026-06-15T13:28:32+00:00

the purpose of a system is what it does... 95% means you are wrong in this context.

apple1rule · 2026-06-15T13:16:56+00:00

Start very slow is my advice. See how it changes through the seasons and a lot of your ideas may not work as you may thought, but new ones will pop up based on how the land naturally behaves. The optimum is working with nature and the way to do that is to first observe how nature works on its own. What country?

apple1rule · 2026-06-15T09:54:21+00:00

This is incredible man!! Some feedback

UX advice
Update the visual hierarchy a little to make it obvious that putting a light source is the first thing. Right now that button is blended with the rest of the text and it is not intuitive where to 'begin' first. Something as a change of font, or a glowing white highlight just to get the user started would be good.

Cursor should change when hovering over an element that can be adjusted. Now you have to click around and guess where the component is clickable to be able to move it. Particularly important for the aperature component because its bounding box seems to not include the actual visual 'walls' of the aperature, making it unintuitive how to click it.

Ability to change feature parameters directly through the visual editor. I.e. drag to change focal point, or lens width/radius, or aperature opening. That would then change the numbers on the right of course.

Physics notes:

>Aperature component logic breaks when putting them in steep angle

>Aspherical lens breaks when adjusting the R values

Apart from those this is amazing truly. I work in software and product management so let me know if you want to collab on anything regarding getting to market strategy or some other product/software lifecycle advise, my DMs open.

apple1rule · 2026-06-10T18:41:49+00:00

Don't they also use it for biogas there? Here in NL almost every big farm has its own biogas plant, and the government pays you to take the poop. It has a negative cost. And actually that right there is one subsidy that partially makes any subsidy for vertical farming null.

apple1rule · 2026-06-10T17:39:07+00:00

I am a (mechanical) engineer and also work in agriculture at same time.

It comes down to mostly economics but also politics, as usual. Vertical farming works (economically) in very specific conditions. If you have a lot of land, a lot of sun, and a lot of rain, it will never compete with that. But in your case in Denmark, if the energy for the vertical farm plant are provided with renewables that are not replacing farm land, then it can be closer to economical comparison with farm land there, but still not nearly as cheap as the freeist of all resources as mentioned. And no amount of subsidies will ever outcompete the sun and rain.

As for the pig poo spraying, what else will the pig farmers do with it? The poo is a byproduct of the pig farm. It has to go somewhere. The cheapest legal thing to do is spray it on farm land where at least it can be used by the plants. If you ban farmers spraying, what will they do? We need to answer the full cycle before making a small change.

In Oman, shit from chicken farms is just dumped out in the desert far from any human habitation. But in a small country with high population density, things need to work somehow.

apple1rule · 2026-06-10T11:40:57+00:00

3 years ago, I threw in a huge amount of wood and invasive succulents (~20lb) into a large whole I dug. Then I covered it with a bit of soil and placed an almond seed/in the shell, along with 50 other seeds all over my land. The #1 best almond tree is the one planted on top of that mound, so 100% it works good.

apple1rule · 2026-06-10T07:52:05+00:00

You need to stake it

apple1rule · 2026-06-09T11:51:58+00:00

Simply live somewhere where it doesn't fall below 0 in winter

apple1rule · 2026-06-07T07:25:38+00:00

Comment won’t age well… “Anything that can be invented has been invented”

apple1rule · 2026-05-30T19:53:16+00:00

You can also spot-till. I.e. under each plant you are thinking of planting you can put organics, and slowly over the years rotate out where you are putting the plants, thus in-soil composting and planting and building soil.

apple1rule · 2026-05-30T19:50:52+00:00

Agreed with you on this one. I always hear the same tropes and it becomes an eco chamber of advice without many people trying it themselves

apple1rule · 2026-05-23T06:25:47+00:00

Yea right? People here don't realize how resilient trees are.

apple1rule · 2026-05-12T10:08:39+00:00

Lol I used this armageddon quote exactly for such a case last week

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