And in the silence, a sound that had been missing for three days came to my ears.

FORBES: Birth, Death and 9/11

As we were being sound-checked, I made a quip about the missing millionaire pilot Steve Fossett.

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He had gone missing on Tuesday and was eventually coaxed back out of the drain by the sound of his owner's voice.

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When an item goes missing, you use a smartphone app to tell the sensor to play a sound, thus alerting you to the item's whereabouts.

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That does not sound insignificant when the next day the tenant in that same apartment goes missing.

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