A New Zealand psychiatrist, Amanda Faulkner, discovered she had life-threatening leukemia thanks to her Apple Watch.The Apple Watch continually flagged an elevated resting heart rate for Amanda, prompting her to seek medical help.Within hours of tests, she was diagnosed with acute myeloid leukemia, and doctors stated that waiting another 48 hours may have been fatal.Amanda's experience highlights the power of wearable devices as early warning systems that encourage people to seek medical assistance sooner.