When the pandemic began, the CDC recommended that people wash their hands a lot.
20 seconds of scrubbing with soap and warm water to dislodge and kill the virus.
To get people to wash their hands for the full 20 seconds, some people sang handwashing songs.
Or recited poems that they liked.
Eventually, smartwatches detected the motion of handwashing and displayed encouraging messages or play handwashing music to keep them going for the full 20 seconds.
Then, when they were done, they’d grab a paper towel, dry their hands, and use the same bathroom doorknob all their infected coworkers used.