As a citizen of a country currently defending in a war, unmanned systems are a literal lifesaver. We can send an armed robot where we previously would have to send a soldier. This is a good thing and before the war many had the same pacifist sentiment in the tech sector, but it's completely reversed now.

Though I can understand your position being in a country that's not defending itself currently.

Paper inside a plastic bottle will be fine.

Soil is acidic, and soda bottles are meant to keep their seal for a two years, not a decade.

Ukraine just made a decision on that, importing fuel from India is going to restricted starting October 1st https://www.pravda.com.ua/eng/news/2025/09/15/7530979/

There are different calibers of mortar shells, bigger size has more range and power. I think author of the article has cheated by not specifying the caliber, because a 155mm artillery shell cost is more than a $1000, precision guided one cost is tens of thousands. While a drone capable of reaching 10km+ costs less than $1000, without payload.

Why are artillery rounds so expensive ? Is it the raw materials ? Is it the precision of machining ? Is it because of what's required to make the entire process safe for workers ?

Ya I didn’t see where the author discussed how imprecise artillery is vs drones. Aren’t mortars even less precise?

Of course they are less precise. And in most cases, they need quite a few rounds to adjust their aim at the target, so his comparaison was already stupid unfair.

He takes into account all the drones that don't work and then goes on and pretends artillery is 100% accurate and has an absurdly low cost (at the price he is quoting, they are basically sending grenades).

Let's not even discuss moving target or penetrating inside fortified targets which mortar will never be able to do.

Run it in a VM.

People want a desktop because they

1. can use a smartphone for all mobile tasks

2. see better on a large screen

3. are more comfortable with a mouse than a trackpad

4. don't have to worry about spilling tea on a laptop or dropping it on the floor. A keyboard is cheap to replace if that happens.

Pipes would either be flexible, or rigid but assembled in sections, so you'd disassemble the pipe while pulling it out.

The flexible pipe has to be strong enough to withstand 160 bar, wide enough to allow the necessary flow, and at the top tolerate one mile of pipe - filled with water - pulling on it. I have no intuition how challenging that would be. Or maybe it does not have to be very flexible, after all submarine gas pipeline are also flexible to some extend. This seems the more realistic option to me if material science does not get in the way.

On the other hand disassembling two miles of a segmented pipe like the ones used for oil drilling in an hour or two does sound pretty ambitious. Drilling pipes are - according to a quick search - up to 45 ft long, so one would have to unscrew more than 200 connections. One could use longer sections but that will probably complicate the handling at the surface and might not actually help in terms of time.

Yes, it doesn't have to be very flexible. But every pipe is flexible to some extent. I'm thinking about my 25m deep well, with 32mm PE pipe, scaled up. It is flexible enough to be forcefully rolled up into a 5m diameter circle. When I've pulled it out, it has naturally bent into a big arch across my yard, under it's own weight. Scale that up in your imagination.

DIY batteries here are usually battery banks assembled from Chinese LiFePo4 cells, plus a Chinese BMS.

Old EU toilets can be poop shelf. When I've shopped for new one in 2015, there was not a single one of that design.

> how do I charge the tenant for electricity?

Just buy another electricity meter and install it after the inverter.