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Many of you are going the wrong way with this. Aeroplane crash detection? Nuclear explosion detection? Meteor strike detection? No. Let's go smaller.

It could sense the particular vibrations of, say, a fart.

"Sending 💩 emoji to your partner. Swipe to cancel".
 
I'll be seriously concerned if the alert ultimately becomes something like:

"COVID-19 detected in proximity to your location. Please report to the nearest re-vaccination clinic"

Which ends up being a gas chamber.
 
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