Chemistry of : Cyanide Poison and Chemical Warfare of WW1

Compound Interest's original post on Chemical Warfare of WW1 is here; on Cyanide Poison here.

For more information about World War One and Life in the trenches, check out these two links. 
BBC: Life on the Frontline includes information, videos, and an interactive on Trench Life.
The Histrory Channel's Life in a Trench

From TED - 8 Great Talks on War and Peace
Here is a TedEd: Lessons from Auschwitz.