I bought some 3D printing filament direct from the manufacturer. It got shipped to me by… Amazon. From an Amazon warehouse. I guess that’s how they do fulfillment. 🤷‍♂️

I AM READY TO BE KILLED BY A HORRIBLE LAVA WORM

I sort of feel bad about raining on the parade of the person distilling isopropanol in his garage earlier, but it really is dangerous.

But most of us chemists also need to be reminded of it. To the point that someone had to write a paper whose entire point is “don’t distill isopropanol”.

Please, don’t do this thing.

The issue with isopropanol peroxide formation is that exposing it to air – even when just using it, like when you’re cleaning parts – starts the process. The air in the head space of your containers is also enough to form them over time. You don’t necessarily need to see solids in the containers for it to be dangerous, since they’ll crystallize out as you concentrate the solution during distillation.

It’s also a numbers game. It probably won’t explode the first time you do it. But there’s a chance each time. Do it enough, and you’ll have an incident.

There are chemical reductants that can clear peroxides. For industrial scale isopropanol distillation, I’m not sure what they use. It may be that they just never distill down to the point that peroxides concentrate to a dangerous level.

I love EnF. But I assure you, organic peroxide formers are scarier.

No no no no no.

I’m a chemist. Organic chemistry PhD, now a process chemist in the industry. I do this for a living. Do not distill isopropanol that’s been exposed to air for any meaningful length of time.

Isopropanol slowly reacts with oxygen in the air to generate peroxides that, when you concentrate them down, EXPLODE. Source. Sorry, not an open access journal. But please take my word for it.

Unless you have a way of confirming the peroxide levels in your isopropanol are near zero, do not concentrate it down by distillation. You’ll blow up your glassware, which will probably expose what you’re distilling to your heat source, which will generate a secondary fireball.

PLEASE do not do this.

My spoiler-free review: oh no

We eat him last.

They sort of do, or they do in a way that makes them almost useless once they hit their final low level. Are you suggesting that instead of asymptotically going to zero, they just hit zero at some point?

Yes. Muzzle loaders. Shoot once, then spend a few minutes loading a powder charge and a bullet down the barrel. They weren’t flintlock muskets like it was the 1700s, they were modern rifles. Just loaded through the muzzles. It gives the deer a fighting chance. You have to hit on the first shot. Did you know that people also hunt with a bow and arrow? Those have been around since the Neolithic. Sometimes not using the most advanced tech is the point.

It’s funny that you typed all that stuff trying to explain firearms to someone who you assume knows nothing about them. I’ve shot everything from pellet guns to the aforementioned muzzle loader to a .30-06 to, yes, an AR-15. I can pick up most guns and check to see if the chamber’s clear. I can disassemble and clean and put them back together.

I want these things to go away. Not just AR-15’s. Anything semiautomatic with a magazine that can hold more than, let’s say, six rounds. Anything beyond a revolver is over the top for personal protection, and if you think that’s not true you’re a lunatic or just want to cosplay army guy. Duh, AR-15’s are the most commonly used firearm in shootings because there’s a lot of them. How about we make there be less of them and other guns that can kill so many people so quickly?

Enforcement at fewer points (manufacturers, distributors) is much easier than at each individual person with a gun being evaluated.

Okay, then. I guess I’ll ignore the muzzle loaders my dad and all his friends used to hunt with until the AR-15 became such a symbol of the “cold dead hands” crowd that they all went ahead and got one. And then a few more.

I think the AR-15 should be banned because I think any semiautomatic rifle and pistol with a magazine capacity of more than a few rounds should be banned. That’s enough for the “guns are easier than getting medicated for anxiety” crowd to feel like they can engage in deadly personal defense without making it easy for someone to walk into a school or church or business and just unload.

I mean depending on who the wellness check is for, the answer may be “they are not well, because they were shot by a cop for no reason, and whoops that was their neighbor, and also the cop shot the neighbor’s dog too”

same as any other rifle

I’m sure the use of AR-15s in shootings has nothing to do with its magazine capacity, firing rate, and deadliness at relatively short out to intermediate range. Not a lot of kids in elementary schools getting killed by people wielding muzzle loaders.

supports the second amendment

I think we should have a well-regulated militia. But I don’t think that every school child should be able to wield an AR-15. I guess that makes me anti-2nd?

1. Hack together a proof of concept
2. Works well enough that management slaps a “done” sticker on it
3. Pile of hacks becomes load bearing
4. One or two dependencies change, the whole thing falls over
5. Set evenings and weekends on fire to fix it
6. Management brags about moving fast and breaking things, engineers quit and become cabbage farmers and woodworkers
7. New graduates are hired, GOTO 1

Hopefully not as a bunch of really good question posts full of mod-deleted answers.

The labrats subreddit was kinda fun. I’m a chemist, but the chemistry subreddit was overwhelmed by people asking for homework advice, showing off bad caffeine tattoos, and getting upset when they couldn’t talk about drugs or explosives.

Yeah, that sounds like seizing Russian assets and selling them to the west with more steps.