They can then enter the recipient or recipients, compose a short message, adjust security settings and send the file.

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"The take-home message for me is that, in clinical settings, wearing a mask or an N95 appears to be essentially equivalent, " says Mark E.

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Message someone over the site and, depending on your privacy settings, he may be a click away from your photos and your entire profile, including news articles you have shared and pictures of that party you were at last night.

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Unless you've changed the default settings on your email, you are treated to a pop-up message, the sound of a bell, or a counter that signals your growing number of unread messages.

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Then, you can use the free Android Gmail app to customise the Label and Notification settings so that the device only alerts you when you have received a message labelled top priority.

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