Louisiana plans to use nitrogen gas to execute death row inmate Jessie Hoffman next week. Here's what to know about the ...

In the lead-up to World War II there were fears that the Germans would attack the UK with poisonous gas, so by 1938 the government had issued respirators to every man, woman and child in the nation.

Now put your books down…and get your gas masks out. Quietly. Now take them carefully out of their boxes - no, no, Isobel, don't drag at it…you show her how to do it, Margaret, will you.