A "You need to self-isolate screen" on the NHS Covid-19 app on a smartphone arranged in London, U.K. (Photographer: Hollie Adams/Bloomberg)
(Bloomberg Businessweek) -- When a woman riding on her motorcycle in rural northern Thailand spotted a cow frothing at the mouth, she pulled over, snapped a few photos, and reported it on a mobile app. Local health authorities stepped in to limit the spread of foot-and-mouth disease to three cows, and farmers averted millions of dollars of potential losses, which would have been catastrophic for the village.