When people are pulled off the street and asked how their hearts are doing, many of them aren't too sure. An AliveCor representative introduces them to KardiaMobile. In 30 seconds, they get a medical-grade EKG reading that can detect atrial fibrillation, which is one of the leading causes of stroke. He suggests the peace of mind the device can provide is worth the $99 it costs to purchase. For a limited time, the device is available for $89 with free shipping.