What's particularly "astonishing" he says, is how precisely the baby responds - in coos and gestures - often exactly in time with the pulse and bar structure of her sounds.

BBC: The universal language of lullabies

Since the FDA gave the big thumbs up to a fully implantable artificial heart earlier this month, cardiac surgeon "Bud" Frazier and his team at the Texas Heart Institute aren't wasting any time in developing what they hope will be a fully-functioning, pulse-free artificial heart.

ENGADGET: HeartMate II: the pulse-free artificial heart

By the time paramedics rushed the 32-year-old to the hospital, doctors could not find a pulse.

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