I've always understood "free as in beer" as: if someone hands you a beer and says it's free, you know that you don't have to pay to consume the beer, but that doesn't mean that you also get the recipe, brewing instructions, factory plans, glass making instructions etc. The only thing that is free is the liquid itself, nothing else.

Part of my PhD involved lots of fluoride synthesis using HF. I always used gloves (changing them very frequently). My advisor never used them for the following reason: if a droplet of HF lands on your glove you won't notice, but HF will go through the glove. If it lands on your bare hand chances are you'll notice it and wash them immediately. I could never follow his advise, but I did change gloves pretty much every step in the synthesis just in case.

I’m definitely in the frequent glove change camp. And PSA for anyone reading this, latex gloves are worse than useless for protection against HF. But hopefully anybody working with HF already knows that.

The MSDS at https://www.nano.pitt.edu/sites/default/files/MSDS/Acids/Hyd... doesn't specifically mention to avoid latex, so it wouldn't be a useful source of information on this point. One of the four times that it mentions gloves, it does specifically specify "neoprene" (not latex nitrile), and the other three times, it doesn't say anything. Even though neoprene is strongly HF-resistant, rereading the MSDS is probably going to be worse than useless to the Etsy moms.

Not sure if you are aware of speed tape https://en.m.wikipedia.org/wiki/Speed_tape

Passenger jets can fly with duct tape on their wings

I meant it more as a "this should hold the wings on just in case they're not well fastened" kind of analogy.

Cool idea! I can't seem to be able to find information about the maps though, like date, author or something similar. I'd really like that!

Agreed about the date. Some maps have the author/publisher's name (look at the top or bottom of the map).

There are a lot of "temporary" internal border checks within Schengen [1], especially in the last 5 years. Wiki has lots of info [2]

I've personally been checked in trains crossing from the east towards Germany multiple times, including the night train.

1. https://www.reddit.com/r/MapPorn/comments/17yy61g/current_re...

2. https://en.m.wikipedia.org/wiki/Schengen_Area under "regulation of internal borders"

In the Netherlands, instant transfers have been possible for at least 5 years. I think also in Belgium. This is indeed being rolled out to the whole EU.

[1] https://www.betaalvereniging.nl/en/focus/giro-based-and-onli...

How this technically works under the hood is less about any technical implementation and more about banks having agreements with each other. That said, it's amazing how fast you get used to instant bank transfers.

In pandas for example that can happen often: `df["count"] == 5` and `df.count == 5` are logically different expressions that will give different answers