Heart doctor: Here are four things I'd need to see before trusting the Apple Watch

CNBC -

CNBC—While the Apple Watch's new features could be a 'game changer' for health, they could also cause problems with false positives or false negatives. One cardiologist told CNBC what she'd like to see Apple do next.

Four things we learned from the Apple Watch 4 teardown. Apple packs a lot into the smaller space, yet makes replacing the screen and the battery easier.