Settle down, everybody. Ready? Well, 'Once upon a time, there was a king…' A teacher takes her young children through their gas mask drill. Gas masks were issued to all children as a precaution ...

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.

Aerosols, often emitted alongside greenhouse gases, can brighten clouds and cause significant ... significant enough to mask a sizable portion of greenhouse gas-related warming.