Gas cell drawing. Inside, an extremely powerful laser strikes helium gas, heats it into a plasma and creates waves that kick electrons from the gas out in a high-energy electron beam.

More than 40 million gas masks were issued. In America there was a gas mask for children that looked like Mickey Mouse, with the character's nose and ears and even a picture of him on the gas filter.

stood trial for a drawing that showed Jesus on a cross with a gas mask, titled Maul halten und weiter dienen (Shut up and do your duty). The work was created, along with some 300 others ...