So by reading about millipedes I ended up on  the wikipedia article on Hydrogen cyanide  and I this caught my attention:   Hydrogen cyanide is also the agent used in gas chambers employed in judicial execution in some U.S. states, where it is produced during the execution by the action of sulfuric acid on an egg-sized mass of potassium cyanide.   Do the U.S. has working gas chambers nowadays? do they actually use them for capital punishment and most important do they use what is basically Zyklon B as the chemical agent?    It would be interesting to draw comparisons between all the security measures and precautions on handling hydrogen cyanide that an actual U.S. gas chamber has to go through and what all the Jewish survivors report from Nazi Germany.