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After much hesitation about how to deal with small and medium-size private enterprises it authorized in 2021, the Cuban government is turning to Russia for help with market reforms.

A phone’s camera lens can measure a heart rate. The microphone, kept by the bedside, can screen for sleep apnea. Even the speaker is being tapped, to monitor breathing. But using smartphones as diagnostic tools is a work in progress, experts say.

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Unless you’ve been offline for the last week, you’ve probably heard about the Federal Aviation Administration’s temporary shutdown of all air traffic. As a West Coast-based flyer with plans for an in-state trip, I awoke last Wednesday morning to news of widespread flight cancellations and delays. My departure flight was going to leave an hour...

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