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Let me see, people are already really upset by cellphone radiations, which are non-ionizing and therefore can only be harmful from the heat it generates.

You would need marketing masterminds to sell this.

All it would take is one mommy blogger to make the connection that cell phone signals are already microwaves.

I swear it works, let me show you.

- No, no one will ever fund this

Cue the discovery of H. Pylori[1] and subsequent acceptance.

[1] http://discovermagazine.com/2010/mar/07-dr-drank-broth-gave-...

Oh yeah I was referencing the show Silicon Valley

That is illegal in the US: there's a regulation that limits microwave power levels outside of an oven to little enough that it doesn't significantly heat anything.

Probably good as microwaves behave very unpredictable in the complex fat-air-water boundaries in a body.

It is hard to rule out that a focused reflection from the head accidentally heat up a part of the retina just a few degrees, which might blind someone.

Or a Japanese invention - kotatsu.

a blanket with a heater under it?

that seems like a terrible idea?