11.   The reverse face mask is used to make a plaster facial bust, which is then used to form the final plastic mask Ben will wear.

12.   They said the masks were safe and that if workers became ill, it was because they did not use the masks properly and smoked cigarettes.

13.   Though this production does not use traditional masks, it does have a scene played in gas masks.

14.   Using masks is a precaution that people may take to protect against plague and other respiratory infections.

15.   Air quality aboard the station was unaffected, but the crew used respirator masks as a precaution, space officials said.

16.   Drivers used their lights at midday, schools were closed and some residents used hospital masks to protect their lungs.

17.   The Chhau dancers enact mythological stories, using the masks to depict animals, gods, goddesses, peacocks, swans and ocean waves.

18.   The FBI said the three men got their moniker because they used surgical masks to hide their faces during several hold-ups.

19.   The masks are used by paramedics, firefighters and police officers who first respond to emergencies.

20.   The media said claims of danger to guards were unfounded and could be addressed by protective measures, such as using surgical masks to conceal their identity.