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There are a lot of interesting things you can do with wifi signals, human bodies show up with a lot of accuracy in them. Such as breathing rate detection, and heart rate.

https://staticfloat.github.io/papers/WiBreathe_PerCom2015.pd...

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Wait, so in a building full of wifi signals, you could theoretically detect a body with no heartbeat or breathing and alert someone automatically?

Possibly, better get a startup going

Seriously, you can do this

A more interesting question is who might be already doing this, and could you write a passive receiver for this to utilise ambient signals versus on purpose emitted ones. Considering it's utility in several scenarios, I can see why some money might be invested in developing this capacity without commercialising it.

Does this have anything to do with the 2.4 GHz band being selected for microwave ovens (and thus, wifi) in the first place, as it apparently has a special effect on water?

Yes it's the same frequency as water molecule's resonance frequency.

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