A decade ago Willy Ssengooba began crisscrossing Uganda, training health-care workers on how to use a new machine to detect tuberculosis. The deadly lung disease infects around 90,000 people in the ...

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Last week, when many Americans were waiting in long lines and scouring drugstores for COVID-19 tests due to the spread of the omicron variant, some Googlers were casually testing daily from the ...