But a vortex mask requires only one telescope whereas an interferometer needs at least two, in order to combine, and thus cancel, several images.

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Dive with mask and snorkel only.

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The man had only one crampon on -- no gloves, no mask.

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But before commuters dash for the mask (and one expert recommended a full facial respirator as the only virus-proof measure), there is cause for optimism.

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The hospital is currently the only one in the South West using the hi-tech mask with radiation treatment known as volumetrically modulated arc therapy (VMAT).

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But there is no denying the game of musical chairs going on in Europe, where overly indebted countries like Ireland borrow money to finance bailouts of their neighbors only to later receive a bailout themselves, all in an attempt to mask the fact that Germany is backstopping the whole thing.

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The only difference is that when we met him he wasn't wearing a Lone Ranger mask.

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Because it has a metallic taste, it can only be used in small amounts and then has to be mixed with other substances that mask its flavors.

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