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Dead Man's Switches: Alerts vs. Final Notices
What do a train pedal, a WiFi sensor that reads your breathing through a wall, and a service that emails your loved ones sixty days after your last check-in have in common? They're all dead man's switches — systems that trigger not on death, but on the absence of a signal. This episode traces the mechanism from its mechanical origins (including the 2003 Waterfall train disaster that forced a redesign) through the two families it split into: emergency alert devices like Halo Home and Silvie, which need continuous proof you're alive and fire in seconds, and post-death notification services like…
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