Wearing face shields, masks, two layers of gloves and navy cotton overalls, two scientists carefully lift off a metal manhole cover to reveal the cumulative waste of some 400 migrant workers.
As one of them lowers a yellow rubber tube into the fetid sewer outside a dormitory in central Singapore, a third explains how samples of the brownish liquid provide a crude snapshot of how the city-state is trying to keep a step ahead of the coronavirus.
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