The new $597 WavWatch 2.0 is on my wrist. If I put it up to my ear, I can hear the high frequency sounds it's emitting. The low hums can be heard a foot away.
Listening to music is a time-tested way to change your mood -- but can it systematically help you sleep better? To find out, I tried Soaak, an app that provides music or nature sounds with particular ...
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