Plague doctors wore masks to limit their exposure to the disease while they treated patients. Outbreaks in the following centuries were understood to be caused by the breakdown of quarantine barriers.

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Anti-pollution masks, worn by some cyclists, won’t have much of an effect unless they’re tight-fitting. But walking on side streets rather than the main road will make a huge difference.

The body language expert added that she saw 'a desire to mask some of his inner emotions' through Prince Harry's 'eyelid-fluttering or stutters'. However, she noted: 'There was a sense of co ...