What if your wristwatch could tell you that you were about to have a heart attack?
You'd be able to chew some aspirin to prevent it. You'd be able to call 911 and get the ambulance on the way. You'd be more likely to survive.

Perhaps a large portion of the 600,000 people who die of heart disease every year — would not.

The good news is this: Apple, which is reportedly working on a "smart" wristwatch, is working on just such a technology.