What he saw amounted to a bunch of awkward glances, so he came up with a simple gesture, involving a hand over the heart, which allows people to simply acknowledge those in uniform.

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Zone: Set a target for pace or heart-rate (with optional heart-rate monitor) and track progress in a simple full-screen graph throughout a workout.

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Heart disease has long been thought of as a simple plumbing failure, with arteries clogging up with fat.

FORBES: Prevention Puzzle