Caesium-137 by Ciro Santilli 37 Updated 2025-07-16
Highly radioactive isotope of caesium with half-life of 30.17 y. Produced from the nuclear fission of uranium, TODO exact reaction, not found in nature.
The fucked thing about this byproduct is that it is in the same chemical family as sodium, and therefore forms a salt that looks like regular table salt, and dissolves in water and therefore easily enters your body and sticks to things.
Another problem is that its half-life is long enough that it doesn't lose radioactivity very quickly compared to the life of a human person, although it is short enough to make it highly toxic, making it a terrible pollutant when released.
This is why for example in the goiânia accident a girl ended up ingesting Caesium-137 after eating an egg after touching the Caesium with her hands.
Injective function by Ciro Santilli 37 Updated 2025-07-16
Mnemonic: in means into. So we are going into a codomain that is large enough so that we can have a different image for every input.
White paper by Ciro Santilli 37 Updated 2025-07-16
White papers are a form of advertisement. They are not peer reviewed papers and are generally not reproducible; their value lies entirely in trust of their publisher rather than being able to verify their claims.
X-ray diffraction by Ciro Santilli 37 Updated 2025-07-16
Often used as a synonym for X-ray crystallography, or to refer more specifically to the diffraction part of the experiment (exluding therefore sample preparation and data processing).
One problem popped up about one year after having bought the blinds in 2019: the blind won't stay still except at the most closed position. Anywhere above it started to slowly go up by itself.
It is not super serious as it covers the two main use cases: full closed and fully open, but it is a bit worrying.
Also, we've had some mold grow on the window, so it is something to look out for, and add some mold spray as it comes up. The fact that the window is dark makes the mold harder to spot.
In 2020 Brazil for example, you are not allowed in theory to obtain a double nationality which you were not allowed to have as a birth right.
This means that Brazilian students e.g. in France, many of whom could easily obtain the French citizenship had to either chose between:
  • giving up their Brazilian citizenship. Who the fuck would do that? Brazilians love their country despite all!
  • not getting French citizenship. This meant in France having to come 6 AM once a year to some police station on some suburbia to stamp a piece of paper, plus having your VISA completely dependant on your employer for several years until you could obtain a permanent VISA, making it very hard to change jobs, and putting you in a constantly precarious position
  • keeping both citizenships, ignoring Brazilian law, which is extremely unlikely to sue you anyways for this bullshit law, and just hope for the best
Can you guess which option Brazilian students would usually pick?
As a poor country, you have to allow people to obtain multiple citizenship. Students are not going to go back because they don't have the foreign citizenship. They are just going to have to ensure shittier jobs for a few years, thus diminishing the chances that they will actually lean anything useful to bring back to your country later on.

There are unlisted articles, also show them or only show them.