Spyke

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Why did the nazis use Zyklon-B instead of CO2?

First: Zyklon B was mainly used in Auschwitz, many other camps did use CO or engine exhaust gases.

Nazi death camps used shower heads to introduce a gas into the gas chambers

No, the showers were simply fake. Zyklon B was inserted from above into metal pipes so it would fall down into the gas chamber. You can see an animation here: https://www.zdf.de/dokumentation/terra-x/die-gaskammern-in-auschwitz-birkenau-creative-commons-100.html

and likely relatively expensive

It was widely used for killing insects for example on ships, cooling houses, mills or other in other storage facilities. In fact the overwhelming part of Zyklon B going to concentration camps was indeed used to kill fleas or lice and not for killing humans. The price was 4.55 RM in 1943 per kg which is roughly the same in Euros today.

It also meant that the gas chambers had to be aerated for a number of minutes

30 to 40 minutes

Why didn’t they simply use CO2

Zyklon B was again a mass product with the corresponding production capacities already there and not expensive. Also it is estimated that around 4kg of Zyklon B are able to kill 1000 people. It is also fast acting and thereby simply very effective in that sense. Plus it was also simple to transport and store as it came on a carrier material, so pressure gas bottles were not necessary but simple metal containers were used.

europe

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Taiwan's TSMC to build semiconductor factory in Germany

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Funny that not only conservatives and the right but also the left is blaming the Greens for everything. The KTF is used only because our finance minister is blocking spending money from other sources, same thing happened with Intel in Magdeburg. So if the economy ministry wants to support these companies, this is their only option.

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Is Turkey now joining the EU? No, but the EU is engaging

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Both are far-right autocratic governments who gladly take EUs money, while blaming everything on EU (in Polands case especially Germany). Both block tons of important political decisions. Hungary is arguably a dictatorship with no free media outlets and questionable elections, Poland steers in the same direction. The widespread racism, antisemitism and homophobia are also a given.