Will this watch turn you into a tech hypochondriac?

Will this watch turn you into a tech hypochondriac?   The new Apple Watch with its in-built electrocardiogram? Not me. But I know people who could be turned.         Which is why this Series 4 watch, targeting ageing worried-well baby boomers, was the star of Apple's big reveal in Cupertino last week.   How the heck do they...

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