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Poison gas was made in Germany, during the WW1.

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The person who invented Poison Gas was Fritz Haber.

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Feitz Harber invented Poison Gas for World War 1. He believed this would "shorten" the war.

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How was Poison Gas innovated and how did it change warfare?

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How was Poison Gas innovated and how did it change warfare?

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What poison gas would do was blister the skin, eyes, and lungs, The gas is very strong that could kill a person within few days and weeks. Poison gas made a huge difference in warfare due to the soldiers not being physically well to fight.

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Poison gas has been restricted, and it is prohibited to used any sort of poisonous gas in the modern days. On 1925 there was a Geneva Protocol banning, "asphyxiating" along with any other deadly gas.