Electrocardiogram in your pocket
I recently had a doctor's appointment where the doctor did a quick Electrocardiogram (EKG) by pulling this tiny sensor out of his pocket. I put my two index fingers on it and rested the back of it against my ankle. In 30 seconds, he had the equivalent of a 6-lead EKG reading on his smartphone, and he determined I did not need to make an appointment for further testing.
